Casio Prw2500t7 Manual

							Operation Guide 3258
MO1106-EA
E-1
ENGLISH
Congratulations upon your selection of this CASIO watch.
ApplicationsThe built-in sensors of this watch measure direction, barometric pressure, temperature and altitude. 
Measured values are then shown on the display. Such features make this watch useful when hiking, 
mountain climbing, or when engaging in other such outdoor activities.
Warning !• The measurement functions built into this watch are not intended for taking measurements that 
require professional or industrial precision. Values produced by this watch should be considered 
as reasonable representations only.
• The Moon phase indicator and tide graph data that appear on the display of this watch are not 
intended for navigation purposes. Always use proper instruments and resources to obtain data for 
navigation purposes.
• This watch is not an instrument for calculating low tide and high tide times. The tide graph of this 
watch is intended to provide a reasonable approximation of tidal movements only.
•When engaging in mountain climbing or other activities in which losing your way can create a 
dangerous or life-threatening situation, always use a second compass to confi rm direction readings.
• Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any damage or loss 
suffered by you or any third party arising through the use of this product or its malfunction.
E-2
About This Manual
• Button operations are indicated using the letters shown in the 
illustration.
• Note that the product illustrations in this manual are intended for 
reference only, and so the actual product may appear somewhat 
different than depicted by an illustration.
(Light)(Light)
E-3
Things to check before using the watch
1. Check the battery power level.
Is “H” or “M” displayed for the battery power indicator (page E-10)?
Go to step 2. Power is low. Charge the watch by placing it in a location 
where it is exposed to light. For details, see “Charging the 
Watch” (page E-9).NO YES
YES Does any one of the following conditions exist?
• Battery power indicator shows “L
” and “LOW
” is flashing on the 
display.
• “C
” is flashing on the display.
• The face is blank.The watch is charged 
sufficiently.
For details about 
charging, see 
“Charging the Watch” 
(page E-9).
NEXT
Battery power 
indicator
E-4
2. Check the Home City and the daylight saving time (DST) setting.
Use the procedure under “To confi gure Home City settings” (page E-28) to confi gure your Home City and 
daylight saving time settings.
Important!
Proper time calibration signal reception, and World Time Mode and Tide/Moon Data Mode data depend 
on correct Home City, time, and date settings in the Timekeeping Mode. Make sure you confi gure these 
settings correctly.
3. Set the current time.
• To set the time using a time calibration signal 
  See “To get ready for a receive operation” (page E-16).
• To set the time manually
  See “Confi guring Current Time and Date Settings Manually” (page E-31).
The watch is now ready for use.
• For details about the watch’s radio controlled timekeeping feature, see “Radio Controlled Atomic 
Timekeeping” (page E-14).
E-5
Contents
E-2 About This Manual
E-3  Things to check before using the watch
E-9 Charging the Watch
E-13  To recover from the sleep state
E-14 Radio Controlled Atomic Timekeeping
E-16  To get ready for a receive operation
E-18  To perform manual receive
E-21  To check the latest signal reception results
E-21  To turn auto receive on and off
E-23 Mode Reference Guide
E-27 Timekeeping
E-28 Confi guring Home City Settings
E-28  To confi gure Home City settings
E-30  To change the Daylight Saving Time (summer time) setting
E-31 Confi guring Current Time and Date Settings Manually
E-31  To change the current time and date settings manually
E-6
E-34 Taking Direction Readings
E-34  To take a digital compass reading
E-37  To perform bidirectional calibration
E-38  To perform northerly calibration
E-39  To perform magnetic declination correction
E-40  To store a direction angle reading in Bearing Memory
E-42  To set a map and fi nd your current location
E-43  To fi nd the bearing to an objective
E-44  To determine the direction angle to an objective on a map and 
head in that direction (Bearing Memory)
E-47  Taking Barometric Pressure and Temperature Readings
E-47  To enter and exit the Barometer/Thermometer Mode
E-47  To take barometric pressure and temperature readings
E-53  To calibrate the pressure sensor and the temperature sensor
E-55 Taking Altitude Readings
E-56  To take an altimeter reading
E-58  To select the altitude auto measurement method
E-59  To specify the altitude differential start point
E-60  To use the altitude differential value
E-61  To specify a reference altitude value
E-62  To save a manual measurement
E-7
E-70  Specifying Temperature, Barometric Pressure, and Altitude Units
E-70  To specify temperature, barometric pressure, and altitude units
E-72  Precautions Concerning Simultaneous Measurement of Altitude and Temperature
E-73 Viewing Altitude Records
E-73  To view altitude records
E-76  To clear the contents of a specifi c memory area
E-77  Viewing Tide and Moon Data
E-78  To enter the Tide/Moon Data Mode
E-79  To view Moon Data for a particular date, or Tide Data for a particular date and time
E-80  To adjust the high tide time
E-81  To reverse the displayed Moon phase
E-86 Using the Alarm
E-86  To enter the Alarm Mode
E-87  To set an alarm time
E-88  To turn an alarm and the Hourly Time Signal on and off
E-88  To stop the alarm
E-89 Using the Stopwatch
E-89  To enter the Stopwatch Mode
E-89  To perform an elapsed time operation
E-89  To pause at a split time
E-90 To measure two fi nishes 
						

							Operation Guide 3258
E-8
E-91  Using the Countdown Timer
E-91  To enter the Countdown Timer Mode
E-93  To confi gure countdown timer settings
E-94  To use the countdown timer
E-94  To turn the progress beeper on and off
E-95  Checking the Current Time in a Different Time Zone
E-95  To enter the World Time Mode
E-95  To view the time in another time zone
E-96  To specify standard time or daylight saving time (DST) for a city
E-97 Illumination
E-97  To turn on illumination manually
E-97  To change the illumination duration
E-99  To turn the auto light switch on and off
E-101 Other Settings
E-101  To turn the button operation tone on and off
E-102  To turn Power Saving on and off
E-103 Troubleshooting
E-109 Specifi cations
E-9
Charging the Watch
The face of the watch is a solar cell that generates power from light. The generated power charges a 
built-in rechargeable battery, which powers watch operations. The watch charges whenever it is exposed 
to light.
Charging Guide
Whenever you are not wearing the 
watch, leave it in a location where it 
is exposed to light.
• Best charging performance is 
achieved by exposing the watch to 
the strongest light available.
When wearing the watch, make sure 
that its face is not blocked from light 
by the sleeve of your clothing.
• The watch may enter a sleep state 
(page E-13) if its face is blocked 
by your sleeve even only partially.
Warning!
Leaving the watch in bright light for charging can cause it to become quite hot.
Take care when handling the watch to avoid burn injury. The watch can become particularly hot 
when exposed to the following conditions for long periods.
• On the dashboard of a car parked in direct sunlight• Too close to an incandescent lamp• Under direct sunlight
E-10
Important!• Allowing the watch to become very hot can cause its liquid crystal display to black out. The 
appearance of the LCD should become normal again when the watch returns to a lower temperature.
• Turn on the watch’s Power Saving function (page E-13) and keep it in an area normally exposed to 
bright light when storing it for long periods. This helps to ensure that power does not run down.
• Storing the watch for long periods in an area where there is no light or wearing it in such a way that it is 
blocked from exposure to light can cause power to run down. Expose the watch to bright light 
whenever possible.
Power LevelsYou can get an idea of the watch’s power level by observing the battery power indicator on the display.
Level Battery Power Indicator Function Status
1
(H)
All functions enabled.
2
(M)
All functions enabled.
3
(L)
Auto and manual receive, illumination, 
beeper, and sensor operation disabled.
4
(C)
Except for timekeeping and the C
 (charge) 
indicator, all functions and display 
indicators disabled.
5
All functions disabled.
Battery power 
indicatorBattery power 
indicator
E-11
• The fl ashing LOW
 indicator at Level 3 (L
) tells you that battery power is very low, and that exposure to 
bright light for charging is required as soon as possible.
• At Level 5, all functions are disabled and settings return to their initial factory defaults. Once the battery 
reaches Level 2 (M
) after falling to Level 5, reconfi gure the current time, date, and other settings.
• Display indicators reappear as soon as the battery is charged from Level 5 to Level 2 (M
).• Leaving the watch exposed to direct sunlight or some other very strong light source can cause the 
battery power indicator to show a reading temporarily that is higher than the actual battery level. The 
correct battery level should be indicated after a few minutes.
• All data stored in memory is deleted, and the current time and all other settings return to their initial 
factory defaults whenever battery power drops to Level 5 and when you have the battery replaced.
Power Recovery Mode• Performing multiple sensor, illumination, or beeper operations during a short period may cause all of 
the battery power indicators (H
,M
, and L
) to start fl ashing on the display. This indicates that the watch 
is in the power recovery mode. Illumination, alarm, countdown timer alarm, hourly time signal, and 
sensor operations will be disabled until battery power recovers.
• Battery power will recover in about 15 minutes. At this time, the battery power indicators (H
,M
,L
) will 
stop fl ashing. This indicates that the functions listed above are enabled again.
• If all of the battery power indicators (H
,M
,L
) are fl ashing and the C
 (charge) indicator also is fl ashing, 
it means the battery level is very low. Expose the watch to bright light as soon as possible.
• Even if battery power is at Level 1 (H
) or Level 2 (M
), the Digital Compass Mode, Barometer/
Thermometer Mode, or Altimeter Mode sensor may be disabled if there is not enough voltage available 
to power it suffi ciently. This is indicated when all of the battery power indicators (H
,M
,L
) are fl ashing.
• Frequent fl ashing of all of the battery power indicators (H
,M
,L
) probably means that remaining battery 
power is low. Leave the watch in bright light to allow it to charge.
E-12
Charging Times
Exposure Level (Brightness)Daily
Operation
*1Level Change *2
Level 5 Level 4 Level 3 Level 2 Level 1
Outdoor sunlight (50,000 lux) 5 min. 2 hours 12 hours 3 hoursSunlight through a window (10,000 lux)24 min. 5 hours 57 hours 16 hours
Daylight through a window on a 
cloudy day (5,000 lux)48 min. 9 hours 115 hours 31 hours
Indoor fl uorescent lighting (500 lux) 8 hours 91 hours – – – – – –
*1 Approximate amount of exposure time required each day to generate enough power for normal daily 
operation.
*2 Approximate amount of exposure time (in hours) required to take power from one level to the next.
• The above exposure times all are for reference only. Actual exposure times depend on lighting 
conditions.
• For details about the operating time and daily operating conditions, see the “Power Supply” section of 
the Specifi cations (page E-112).
E-13
Power SavingWhen turned on, Power Saving enters a sleep state automatically whenever the watch is left for a certain 
period in an area where it is dark. The table below shows how watch functions are affected by Power 
Saving.
• For information about enabling and disabling power saving, see “To turn Power Saving on and off” 
(page E-102).
• There actually are two sleep state levels: “display sleep” and “function sleep”.Elapsed Time in Dark Display Operation
60 to 70 minutes (display sleep) Blank, with PS
 fl ashing Display is off, but all functions are enabled.
6 or 7 days (function sleep) Blank, with PS
 not fl ashingAll functions are disabled, but timekeeping is 
maintained.
• The watch will not enter a sleep state between 6:00 AM and 9:59 PM. If the watch is already in a sleep 
state when 6:00 AM arrives, however, it will remain in the sleep state.
• The watch will not enter a sleep state while it is in the Stopwatch Mode or Countdown Timer Mode.
To recover from the sleep state
Move the watch to a well-lit area, press any button, or angle the watch towards your face for reading (page 
E-98).
E-14
Radio Controlled Atomic Timekeeping
This watch receives a time calibration signal and updates its time setting accordingly. However, when 
using the watch outside of areas covered by time calibration signals, you will have to adjust the settings 
manually as required. See “Confi guring Current Time and Date Settings Manually” (page E-31) for more 
information.
This section explains how the watch updates its time settings when the city code selected as the Home 
City is in Japan, North America, Europe, or China, and is one that supports time calibration signal 
reception.
If your Home City Code setting is this:The watch can receive the signal from the transmitter 
located here:
LIS, LON, MAD, PAR, ROM, BER, STO, ATH, MOW Anthorn (England), Mainfl ingen (Germany)
HKG, BJS Shangqiu City (China)
TPE, SEL, TYO Fukushima (Japan), Fukuoka/Saga (Japan)
HNL, ANC, YVR, LAX, YEA, DEN, MEX, CHI, NYC, YHZ, 
YYTFort Collins, Colorado (United States)
Important!• The areas covered by MOW
,HNL
 and ANC
 are quite far from the calibration signal transmitters, so 
certain conditions may cause reception problems.
• When HKG
 or BJS
 is selected as the Home City, only the time and date are adjusted according to the 
time calibration signal. You need to switch manually between standard time and daylight saving time 
(DST) if required. See “To confi gure Home City settings” (page E-28) for information about how to do 
this.
E-15
Approximate Reception Ranges
UK and German Signals
Anthorn
500 kilometers
1,500 kilometers
The Anthorn signal is 
receivable within this areaMainflingen2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins North American Signal
Japanese Signals Chinese Signal
500 kilometersChangchun
Beijing
Shangqiu
Shanghai
Chengdu
Hong Kong
1,500 kilometers
1,000 kilometers
Signals are receivable in the Taiwan area 
when reception conditions are 
good. Fukuoka/Saga500 kilometersFukushima 
						

							Operation Guide 3258
E-16
• Even when the watch is within range of a transmitter, signal reception may be impossible due to the 
effects of geographic contours, structures, weather, the time of year, the time of day, radio interference, 
etc. The signal becomes weaker at distances of approximately 500 kilometers, which means that the 
infl uence of the conditions listed above becomes even greater.
• Signal reception may not be possible at the distances noted below during certain times of the year or 
day. Radio interference may also cause problems with reception.
Mainfl ingen (Germany) or Anthorn (England) transmitters: 500 kilometers (310 miles) 
Fort Collins (United States) transmitter: 600 miles (1,000 kilometers) 
Fukushima or Fukuoka/Saga (Japan) transmitters: 500 kilometers (310 miles) 
Shangqiu (China) transmitter: 500 kilometers (310 miles)
• As of May 2011, China does not use Daylight Saving Time (DST). If China does go to the Daylight 
Saving Time system in the future, some functions of this watch may no longer operate correctly.
To get ready for a receive operation
1. Confi rm that the watch is in the Timekeeping Mode. If it isn’t, use D
 to enter the Timekeeping Mode 
(page E-24).
2. The antenna of this watch is located on its 12 o’clock side. Position the watch with 12 o’clock facing 
towards a window as shown in the nearby illustration. Make sure there are no metal objects nearby.
• Signal reception normally is better at night.• The receive operation takes from two to seven minutes, 
but in some cases it can take as long as 14 minutes. Take 
care that you do not perform any button operation or 
move the watch during this time.12 o’clock
or12 o’clock
or
E-17
• Signal reception may be diffi cult or even impossible under the conditions described below.
Inside or 
among
buildingsInside a 
vehicleNear
household
appliances,
offi ce 
equipment,
or a mobile 
phoneNear a 
construction
site, airport, 
or other 
sources of 
electrical
noiseNear
high-tension
power linesAmong or 
behind
mountains
3. What you should do next depends on whether you are using Auto Receive or Manual Receive.• Auto Receive: Leave the watch over night in the location you selected in step 2. See “Auto 
Receive” below for details.
• Manual Receive: Perform the operation under “To perform manual receive” on page E-18.
Auto Receive
• With Auto Receive, the watch performs the receive operation each day automatically up to six times (up 
to fi ve times for the Chinese calibration signal) between the hours of midnight and 5 a.m. (according to 
the Timekeeping Mode time). When any receive operation is successful, none of the other receive 
operations for that day are performed.
• When a calibration time is reached, the watch will perform the receive operation only if it is in the 
Timekeeping Mode or World Time Mode. The receive operation is not performed if a calibration time is 
reached while you are confi guring settings.
E-18
• You can use the procedure under “To turn auto receive on and off” (page E-21) to enable or disable 
auto receive.
To perform manual receive
1. Use D
 to select the Receive Mode (R
/C
) as shown on page E-24.
2. Hold down A
 until RC Hold
 appears on the display and then 
disappears.
• A signal level indicator (L1,L2, or L3, see page E-20) will appear 
on the display after reception starts. Do not allow the watch to 
move and do not perform any button operation until GET or ERR
appears on the display.
• If the receive operation is successful, the reception date and time 
appear on the display, along with the GET indicator.
The watch will return to the Timekeeping Mode if you press D
 or 
if you do not perform any button operation for about two or three 
minutes.
Receiving
Receiving indicator
Receive successfulReceiving
Receiving indicator
Receive successful
E-19
• If the current reception fails but a previous reception (within the 
last 24 hours) was successful, the display shows the receiving 
indicator and the ERR indicator. If the ERR indicator only is 
displayed (without the receiving indicator), it means that all of the 
receive operations over the past 24 hours have failed.
The watch will return to the Timekeeping Mode without changing 
the time setting if you press D
 or if you do not perform any button 
operation for about two or three minutes.
Note
You can interrupt a time calibration signal reception operation by 
pressing any button.Receive failed
If there was a previously 
successful receptionReceive failed
If there was a previously 
successful reception
E-20
Signal Level IndicatorDuring manual receive, the signal level indicator displays the signal level 
as shown below.
Weak (Unstable) Strong (Stable)
As you watch the indicator, keep the watch in a location that best 
maintains stable reception.
• Even under optimum reception conditions, it can take about 10 
seconds for reception to stabilize.
• Note that weather, the time of day, surroundings, and other factors all 
can affect reception.
Signal level indicatorSignal level indicator
E-21
To check the latest signal reception results
Enter the Receive Mode (page E-24).
• When receive is successful, the display shows the time and date that 
receive was successful. - : - -
 indicates that none of the reception 
operations were successful.
• To return to the Timekeeping Mode, press D
.
Note
The receiving indicator will not be displayed if you have adjusted the 
time or date setting manually since the last receive operation.
To turn auto receive on and off
1. Enter the Receive Mode (page E-24).
2. Hold down E
 until On
 or OFF
 fl ashes on the display. This is the 
setting screen.
• Note that the setting screen will not appear if the currently selected 
Home City is one that does not support time calibration reception.
3. Press A
 to toggle auto receive on (On
) and off (OFF
).
4. Press E
 to exit the setting screen.
Receiving
indicatorReceiving
indicator
On/Off statusReceiving
indicatorOn/Off statusReceiving
indicator
E-22
Radio-controlled Atomic Timekeeping Precautions• Strong electrostatic charge can result in the wrong time setting.• Even if a receive operation is successful, certain conditions can cause the time setting to be off by up 
to one second.
• The watch is designed to update the date and day of the week automatically for the period January 1, 
2000 to December 31, 2099. Updating of the date by signal reception will no longer be performed 
starting from January 1, 2100.
• If you are in an area where signal reception is not possible, the watch keeps time with the precision 
noted in “Specifi cations”.
• The receive operation is disabled under any of the following conditions.
– While power is at Level 3 (L
) or lower (page E-10)
– While the watch is in the power recovery mode (page E-11)
– While a sensor operation is being performed
– When the watch is in the function sleep state (“Power Saving”, page E-13)
– While a countdown timer operation is in progress (page E-91)
• A receive operation is cancelled if an alarm sounds while it is being performed.• The Home City setting reverts to the initial default of TYO
 (Tokyo) whenever the battery power level 
drops to Level 5 or when you have the rechargeable battery replaced. If this happens, change the 
Home City to the setting you want (page E-28) .
E-23
Mode Reference Guide
Your watch has 11 “modes”. The mode you should select depends on what you want to do.To do this: Enter this mode: See:• View the current date in the Home City• Confi gure Home City and daylight saving time (DST) settings• Confi gure time and date settings manuallyTimekeeping Mode E-27• Determine your current bearing or the direction from your current 
location to a destination as a direction indicator and angle value
• Determine your current location using the watch and a mapDigital Compass Mode E-34• View the barometric pressure and temperature at your current location• View a graph of barometric pressure readingsBarometer/Thermometer
ModeE-47• View the altitude at your current location• Determine the altitude differential between two locations (reference 
point and current location)
• Record an altitude reading with the measurement time and dateAltimeter Mode E-55
View information about tide conditions and the Moon phase Tide/Moon Data Mode E-77
Recall records created in the Altimeter Mode Data Recall Mode E-73
Set an alarm time Alarm Mode E-86
Use the stopwatch to measure elapsed time Stopwatch Mode E-89
Use the countdown timer Countdown Timer Mode E-91
View the current time in one of 48 cities (31 time zones) around the globe World Time Mode E-95
• Perform a time calibration receive operation• Check whether the last receive operation was successfulReceive Mode E-18 
						

							Operation Guide 3258
E-24
Selecting a Mode• The illustration below shows which buttons you need to press to navigate between modes.• To return to the Timekeeping Mode from any other mode, hold down D
 for about two seconds.
World Time 
Mode Data Recall 
ModeTide/Moon Data 
Mode
Stopwatch ModeCountdown
Timer ModeReceive ModeTimekeeping Mode
Alarm Mode
World Time 
Mode Data Recall 
ModeTide/Moon Data 
Mode
Stopwatch ModeCountdown
Timer ModeReceive ModeTimekeeping Mode
Alarm Mode
E-25
• You can use buttons A
,B
, and C
 to enter a sensor mode directly from the Timekeeping Mode or 
from another sensor mode. To enter a sensor mode from the Tide/Moon Data, Data Recall, Alarm, 
Stopwatch, Countdown Timer, World Time, or Receive Mode, fi rst enter the Timekeeping Mode and 
then press the applicable button.
Altimeter Mode Barometer/
Thermometer Mode Digital Compass Mode
Sensor Modes
Altimeter Mode Barometer/
Thermometer Mode Digital Compass Mode
Sensor Modes
E-26
General Functions (All Modes)
The functions and operations described in this section can be used in all of the modes.
Direct Timekeeping Mode Access
• To enter the Timekeeping Mode from any other mode, hold down D
 for about two seconds.
Auto Return Features
• The watch will automatically return to the Timekeeping Mode if you do not perform any button operation 
for a particular amount of time in each mode.
Mode Name Approximate Elapsed Time
Tide/Moon Data, Data Recall, Alarm, Receive, Digital 
Compass3 minutes
Altimeter 1 hour minimum
24 hours maximum
Barometer/Thermometer 24 hours
Setting screen (digital setting fl ashing) 3 minutes
• If you leave a screen with fl ashing digits on the display for two or three minutes without performing any 
operation, the watch exits the setting screen automatically.
Initial Screens
When you enter the Data Recall, Alarm, World Time, or Digital Compass Mode, the data you were viewing 
when you last exited the mode appears fi rst.
Scrolling
TheA
 and C
 buttons are used on the setting screen to scroll through data on the display. In most 
cases, holding down these buttons during a scroll operation scrolls through the data at high speed.
E-27
Timekeeping
Use the Timekeeping Mode (HOME
) to set and view the current time and date.• Each press of E
 in the Timekeeping Mode will change screen contents as shown below.• If you leave the Tide Graph on the display, it will automatically return to the year screen after about 24 
hours.
Year Screen Tide Graph Screen
Barometric
pressure
graphDay of week
Seconds
Hour : 
MinutesYearTide graph
Month Day Moon phase 
indicator
PM
indicator
E-28
Confi guring Home City Settings
There are two Home City settings: actually selecting the Home City and selecting either standard time or 
daylight saving time (DST).
To confi gure Home City settings
1. In the Timekeeping Mode, hold down E
 until SET Hold
 appears on 
the display and then the city code starts to fl ash.
• The watch will exit the setting mode automatically if you do not 
perform any operation for about two or three minutes.
• For details about city codes, see the “City Code Table” at the back 
of this manual.
2. Use A
 (East) and C
 (West) to scroll through the available city codes.
• Keep scrolling until the city code you want to select as your Home 
City is displayed.
3. Press D
 to display the DST setting screen.
4.
UseA
 to cycle through the DST settings in the sequence shown below.
Auto DST (AUTO)DST off (OFF)
DST on (ON
)
PM
indicatorCity code
Year
Month Day
Seconds Hour : 
Minutes
DST indicatorPM
indicatorCity code
Year
Month Day
Seconds Hour : 
Minutes
DST indicator
E-29
• The Auto DST (AUTO) setting will be available only when a city code that supports time calibration 
signal reception (page E-14) is selected as the Home City. While Auto DST is selected the DST 
setting will be changed automatically in accordance with time calibration signal data.
• Note that you cannot switch between standard time and daylight saving time (DST) while UTC is 
selected as your Home City.
5. After all of the settings are the way you want, press E
 to exit the setting screen.
• To return to the screen in step 1, press E
 again.• The DST indicator appears to indicate that Daylight Saving Time is turned on.
Note
• After you specify a city code, the watch will use UTC* offsets in the World Time Mode to calculate 
the current time for other time zones based on the current time in your Home City.
* Coordinated Universal Time, the world-wide scientifi c standard of timekeeping. 
The reference point for UTC is Greenwich, England.
• Selecting some city codes automatically makes it possible for the watch to receive the time 
calibration signal for the corresponding area. See page E-14 for details.
E-30
To change the Daylight Saving Time (summer time) setting
1. In the Timekeeping Mode, hold down E
 until SET Hold
 appears on 
the display and then the city code starts to fl ash.
2. Press D
 to display the DST setting screen.
3. Use A
 to cycle through the DST settings in the sequence shown 
below.
Auto DST (AUTO)DST off (OFF)
DST on (ON
)
• The Auto DST (AUTO) setting will be available only when a city 
code that supports time calibration signal reception (page E-14) 
is selected as the Home City. While Auto DST is selected the DST 
setting will be changed automatically in accordance with time 
calibration signal data.
4. After all of the settings are the way you want, press E
 to exit the 
setting screen.
• To return to the screen in step 1, press E
 again.• The DST indicator appears to indicate that Daylight Saving Time is 
turned on.
DST indicatorDST indicator
E-31
Confi guring Current Time and Date Settings Manually
You can confi gure current time and date settings manually when the watch is unable to receive a time 
calibration signal.
To change the current time and date settings manually
1. In the Timekeeping Mode, hold down E
 until SET Hold
 appears on 
the display and then the city code starts to fl ash.
PM
indicatorCity
code
Month Day Seconds
Hour : MinutesYearPM
indicatorCity
code
Month Day Seconds
Hour : MinutesYear 
						

							Operation Guide 3258
E-32
2. Press D
 to move the fl ashing in the sequence shown below to select the other settings.
Thermometer/Barometer/
Altitude unitPower
SavingIllumination
DurationButton Operation 
Tone On/OffDay Month City Code
DST12/24-Hour
FormatSeconds Hour Minutes Year
• The following steps explain how to confi gure timekeeping settings only.
3. When the timekeeping setting you want to change is fl ashing, use A
 and/or C
 to change it as 
described below.
Screen To do this: Do this:Change the city code Use A
 (East) and C
 (West).
Cycle between Auto DST (AUTO
), Daylight Saving 
Time (ON
) and Standard Time (OFF
).PressA
.
Toggle between 12-hour (12H
) and 24-hour (24H
)
timekeeping.PressA
.
Reset the seconds to 00
(If the current seconds count is between 30 and 59, 
one is added to the minute count).PressA
.
Change the hour or minutes
UseA
 (+) and C
 (–).
Change the year, month, or day
E-33
4. After all of the settings are the way you want, press E
 to exit the setting screen.• To return to the screen in step 1, press E
 again.
Note
• For information about selecting a Home City and confi guring the DST setting, see “Confi guring 
Home City Settings” (page E-28).
• While the 12-hour format is selected for timekeeping, a P (PM) indicator will appear for times from 
noon to 11:59 p.m. No indicator appears for times from midnight to 11:59 a.m. With 24-hour format, 
time is displayed from 0:00 to 23:59, without any P (PM) indicator.
• The watch’s built-in full automatic calendar makes allowances for different month lengths and leap 
years. Once you set the date, there should be no reason to change it except after you have the 
watch’s rechargeable battery replaced or after power drops to Level 5 (page E-10).
• The day of the week changes automatically when the date changes.• Refer to the pages shown below for more information on Timekeeping Mode settings.
- Button operation tone on/off: “To turn the button operation tone on and off” (page E-101)
- Illumination duration setting: “To change the illumination duration” (page E-97)
- Enabling and disabling power saving: “To turn Power Saving on and off” (page E-102).
- Changing the temperature, barometric pressure, and altitude units (for a city code other than TYO
):
“To specify temperature, barometric pressure, and altitude units” (page E-70)
E-34
Taking Direction Readings
In the Digital Compass Mode, a built-in bearing sensor detects magnetic north at regular intervals and 
indicates one of 16 directions on the display.
To take a digital compass reading
1. Make sure the watch is in the Timekeeping Mode or any one of the 
sensor modes.
•The sensor modes are: Digital Compass Mode, Barometer/
Thermometer Mode, and Altimeter Mode.
2. Place the watch on a fl at surface. If you are wearing the watch, make 
sure that your wrist is horizontal (in relation to the horizon).
3. Point the 12 o’clock position of the watch in the direction you want to 
measure.
4. Press C
 to start digital compass measurement.
•COMP will appear on the display to indicate that a digital compass 
operation is in progress.
•See “Digital Compass Readings” on page E-35 for information 
about what appears on the display.
Note
•If there is a value directly below the current time (center right of the 
display), it means that the bearing memory screen (page E- 40) is 
displayed. If this happens, press E
 to exit the bearing memory 
screen.
5. After you are fi nished using the digital compass, press D
 to return to the Timekeeping Mode.
NW
0WNWWWSWSWSSWSSSESEESEEENENENNENNNW
90
180270
12 o’clock position
Current time North pointer Direction
indicator
Angle value (in degrees)
NW
0WNWWWSWSWSSWSSSESEESEEENENENNENNNW
90
180270
12 o’clock position
Current time North pointer Direction
indicator
Angle value (in degrees)
E-35
Digital Compass Readings• When you press C
to start digital compass measurement, COMP
 will initially appear on the display to 
indicate that a digital compass operation is in progress.
• About two seconds after you start a digital compass measurement operation, letters on the display will 
indicate the direction that the 12 o’clock position of the watch is pointing. Four pointers that indicate 
magnetic north, south, east, and west will also appear.
• After the fi rst reading is obtained, the watch will continue to take digital compass readings automatically 
each second for up to 20 seconds. After that, measurement will stop automatically.
• The direction indicator and angle value will show - - -
 to indicate that digital compass readings are 
complete.
• The auto light switch is disabled during the 20 seconds that digital compass readings are being taken. • The following table shows the meanings of each of the direction abbreviations that appear on the 
display.
Direction Meaning Direction Meaning Direction Meaning Direction Meaning
N
NorthNNENorth-
northeastNE
NortheastENEEast-
northeast
E
EastESEEast-
southeastSE
SoutheastSSESouth-
southeast
S
SouthSSWSouth-
southwestSW
SouthwestWSWWest-
southwest
W
WestWNWWest-
northwestNW
NorthwestNNWNorth-
northwest
• The margin of error for the angle value and the direction indicator is ±11 degrees while the watch is 
horizontal (in relation to the horizon). If the indicated direction is northwest (NW
) and 315 degrees, for 
example, the actual direction can be anywhere from 304 to 326 degrees.
E-36
• Note that taking a measurement while the watch is not horizontal (in relation to the horizon) can result in 
large measurement error.
•You can calibrate the bearing sensor if you suspect the direction reading is incorrect.• Any ongoing direction measurement operation is paused temporarily while the watch is performing an 
alert operation (daily alarm, Hourly Time Signal, countdown timer alarm) or while illumination is turned 
on (by pressing L
). The measurement operation resumes for its remaining duration after the operation 
that caused it to pause is fi nished.
• See “Digital Compass Precautions” (page E-46) for important information about taking direction readings.
Calibrating the Bearing SensorYou should calibrate the bearing sensor whenever you feel that the direction readings being produced by 
the watch are off. You can use any one of three different bearing sensor calibration methods: bidirectional 
calibration, northerly calibration, or magnetic declination correction.
• Bidirectional Calibration and Northerly Calibration
Bidirectional calibration and northerly calibration calibrate the accuracy of the bearing sensor in relation 
to magnetic north. Use bidirectional calibration when you want to take readings within an area exposed 
to magnetic force. This type of calibration should be used if the watch becomes magnetized for any 
reason. With northerly calibration, you “teach” the watch which way is north (which you have to determine 
with another compass or some other means).
Important!
The more correctly you perform bidirectional calibration, the better the accuracy of the bearing sensor 
readouts. You should perform bidirectional calibration whenever you change environments where you 
use the bearing sensor, and whenever you feel that the bearing sensor is producing incorrect readings.
E-37
• Magnetic Declination Correction
With magnetic declination correction, you input a magnetic declination angle (difference between 
magnetic north and true north), which allows the watch to indicate true north. You can perform this 
procedure when the magnetic declination angle is indicated on the map you are using. Note that you can 
input the declination angle in whole degree units only, so you may need to round off the value specifi ed 
on the map. If your map indicates the declination angle as 7.4°, you should input 7°. In the case of 7.6° 
input 8°, for 7.5° you can input 7° or 8°.
Precautions about bidirectional calibration
• You can use any two opposing directions for bidirectional calibration. You must, however, make sure 
that they are 180 degrees opposite each other. Remember that if you perform the procedure 
incorrectly, you will get wrong bearing sensor readings.
• Do not move the watch while calibration of either direction is in progress.• You should perform bidirectional calibration in an environment that is the same as that where you plan 
to be taking direction readings. If you plan to take direction readings in an open fi eld, for example, 
calibrate in an open fi eld.
To perform bidirectional calibration
1. In the Digital Compass Mode, hold down E
 until SET Hold
 appears 
on the display and then the magnetic declination settings start to fl ash.
2. Press D
 to display the bidirectional calibration screen.
• At this time, the north pointer fl ashes at the 12 o’clock position 
and the display will show -1- to indicate that the watch is ready to 
calibrate the fi rst direction.
E-38
3. Place the watch on a level surface facing any direction you want, and press C
 to calibrate the fi rst 
direction.
•- - - is shown on the display while calibration is being performed. When calibration is successful, 
the display will show OK and -2-, and the north pointer fl ashing at the 6 o’clock position. This 
means that the watch is ready for calibration of the second direction.
4. Rotate the watch 180 degrees.
5. Press C
 again to calibrate the second direction.
•- - - is shown on the display while calibration is being performed. When calibration is successful, 
the display will show OK and then change to the Digital Compass Mode screen.
To perform northerly calibration
Important!
If you want to perform both northerly and bidirectional calibration, perform bidirectional calibration fi rst, 
and then perform northerly calibration. This is necessary because bidirectional calibration cancels any 
existing northerly calibration setting.
1. In the Digital Compass Mode, hold down E
 until SET Hold
 appears 
on the display and then the magnetic declination settings start to fl ash.
2. Press D
 twice to display the northerly calibration screen.
• At this time, -n- (north) appears on the display.
3. Place the watch on a level surface, and position it so that its 12 o’clock 
position points north (as measured with another compass).
E-39
4. Press C
 to start the calibration operation.•- - - is shown on the display while calibration is being performed. When calibration is successful, 
the display will show OK and then change to the Digital Compass Mode screen.
To perform magnetic declination correction
1. In the Digital Compass Mode, hold down E until SET Hold
 appears on 
the display and then the magnetic declination settings start to fl ash.
2. Use A
 (East) and C
 (West) to change the settings.•The following explains magnetic declination angle direction 
settings.
OFF
: No magnetic declination correction performed. The magnetic 
declination angle with this setting is 0°.
E
:        When magnetic north is to the east (east declination)
W
:       When magnetic north is to the west (west declination)
• You can select a value within the range of W 90° to E 90° with 
these settings.
• You can turn off (OFF) magnetic declination correction by pressing 
A
 and C
 at the same time.
• The illustration, for example, shows the value you should input 
and the direction setting you should select when the map shows a 
magnetic declination of 1° West.
3. When the setting is the way you want, press E
 to exit the setting 
screen.
Magnetic declination angle 
direction value (E, W, or OFF)
Magnetic declination 
angle valueMagnetic declination angle 
direction value (E, W, or OFF)
Magnetic declination 
angle value 
						

							Operation Guide 3258
E-40
Using Bearing Memory
Bearing Memory lets you temporarily store and display a direction reading 
so you can use it as a reference as you take subsequent digital compass 
readings. The Bearing Memory screen displays the direction angle for the 
stored reading, along with an indicator that indicates the stored reading.
When you take digital compass readings while the Bearing Memory 
screen is displayed, the direction angle of the current digital compass 
reading (as read from the 12 o’clock position of the watch) and the stored 
Bearing Memory direction reading will both be shown.
To store a direction angle reading in Bearing Memory
1. Press C
 to start a digital compass measurement operation (page E-34).• This will take an initial reading and then take readings every 
second for 20 seconds.
• If a bearing memory direction angle value is already displayed, it 
means that there is a reading already stored in Bearing Memory. If 
this happens, press E
 to clear the Bearing Memory reading and 
exit the bearing memory screen before performing the above step.
2. During the 20 seconds that digital compass readings are being taken, press 
E to store the current 
reading in Bearing Memory.
• The Bearing Memory direction angle fl ashes for about one second as it is stored in Bearing 
Memory. After that, the Bearing Memory screen (which shows the bearing memory direction 
angle) will appear, and a new 20 -second direction reading operation will start.
• You can press C
 at any time while the Bearing Memory screen is displayed, to start a new 
20 -second direction reading operation. Doing so will display the direction angle for the direction 
that the 12 o’clock position of the watch is pointed. The direction angle of the current reading will 
disappear from the display after the 20 -second direction reading operation is complete.
12 o’clock position
North pointer
Direction
angle of 
current
reading
Bearing Memory 
ScreenBearing memory 
direction angle valueBearing
memory
pointer12 o’clock position
North pointer
Direction
angle of 
current
reading
Bearing Memory 
ScreenBearing memory 
direction angle valueBearing
memory
pointer
E-41
• During the fi rst 20 seconds after you display the Bearing Memory screen or during a 20 -second 
direction reading operation you triggered by pressing C
 while the Bearing Memory screen is on 
the display, the direction stored in memory is indicated by a Bearing Memory pointer.
• Pressing E
 while the Bearing Memory screen is displayed will clear the reading currently in 
Bearing Memory and start a new 20 -second direction reading operation.
Using the Digital Compass While Mountain Climbing or HikingThis section provides three practical applications for using the watch’s built-in digital compass.• Setting a map and fi nding your current location 
Having an idea of your current location is important when mountain climbing or hiking. To do this, you 
need to “set the map”, which means to align the map so the directions indicated on it are aligned with 
the actual directions of your location. Basically what you are doing is aligning north on the map with 
north as indicated by the watch.
• Finding the bearing to an objective• Determining the direction angle to an objective on a map and heading in that direction
E-42
To set a map and fi nd your current location
1. With the watch on your wrist, position it so the face is horizontal.
2. While in the Timekeeping Mode or in any of the sensor modes, press C
 to take a compass reading.
• The reading will appear on the display after about two seconds.
3. Rotate the map without moving the watch so the northerly direction 
indicated on the map matches north as indicated by the watch.
• If the watch is confi gured to indicate magnetic north, align the 
map’s magnetic north with the watch indication. If the watch has 
been confi gured with a declination to correct to true north, align 
the map’s true north with the watch indication. For details, see 
“Calibrating the Bearing Sensor” (page E-36).
• This will position the map in accordance with your current location.
4. Determine your location as you check the geographic contours around 
you.
N
N
North indicated 
on the map
North indicated by 
north pointer
N
N
North indicated 
on the map
North indicated by 
north pointer
E-43
To fi nd the bearing to an objective
1. Set the map so its northerly indication is aligned with north as indicated 
by the watch, and determine your current location.
• See “To set a map and fi nd your current location” on page E- 42 for 
information about how to perform the above step.
2. Set the map so the direction you want to travel on the map is pointed 
straight in front of you.
3. With the watch on your wrist, position it so the face is horizontal.
4. While in the Timekeeping Mode or in any of the sensor modes, press 
C
 to take a compass reading.
• The reading will appear on the display after about two seconds.
5. Still holding the map in front of you, turn your body until north as 
indicated by the watch and the northerly direction on the map are 
aligned.
• This will position the map in accordance with your current location, 
so the bearing to your objective is straight ahead of you.
N
N
Objective
Current
location
12 o’clock 
position
N
N
Objective
Current
location
12 o’clock 
position
E-44
To determine the direction angle to an objective on a map and head in that direction (Bearing Memory)1. Set the map so its northerly indication is aligned with north as indicated 
by the watch, and determine your current location.
• See “To set a map and fi nd your current location” on page E- 42 for 
information about how to perform the above step.
2. As shown in the illustration to the left, change your position so you (and 
the 12 o’clock position of the watch) are pointed in the direction of 
objective, while keeping the northerly direction indicated on the map 
aligned with north as indicated by the watch.
• If you fi nd it dif fi cult to perform the above step while keeping 
everything aligned, fi rst move into the correct position (12 o’clock 
position of the watch pointed at the objective) without worrying 
about the orientation of the map. Next, perform step 1 again to set 
the map.
N
N
Objective
Current
location
12 o’clock 
position
N
N
Objective
Current
location
12 o’clock 
position
E-45
3. While in the Timekeeping Mode or in any of the sensor modes, press 
C
 to take a compass reading.
4. While direction angle readings are in progress, press E
 to record the 
currently displayed direction in Bearing Memory.
• The direction angle value and pointer stored in Bearing Memory 
will remain on the display for about 20 seconds.
• To re-display the Bearing Memory direction angle value and 
Bearing Memory pointer, press C
.
• See “Using Bearing Memory” (page E- 40) for more information.
5. Now you can advance while monitoring the Bearing Memory pointer to 
ensure that it remains in the 12 o’clock position.
• Pressing E
 while the Bearing Memory direction angle value and 
Bearing Memory pointer are on the display will clear the Bearing 
Memory data you saved in step 3 and save the current direction 
reading in Bearing Memory.
Note
• When mountain climbing or hiking, conditions or geographic 
contours may make it impossible for you to advance in a straight 
line. If this happens, return to step 1 and save a new direction to 
the objective.
12 o’clock position
Bearing memory 
pointer North
pointer
Direction angle of 
current reading
Bearing memory 
direction angle value12 o’clock position
Bearing memory 
pointer North
pointer
Direction angle of 
current reading
Bearing memory 
direction angle value
E-46
Digital Compass Precautions
This watch features a built-in magnetic bearing sensor that detects terrestrial magnetism. This means that 
north indicated by this watch is magnetic north, which is somewhat different from true polar north. The 
magnetic north pole is located in northern Canada, while the magnetic south pole is in southern Australia. 
Note that the difference between magnetic north and true north as measured with all magnetic compasses 
tends to be greater as one gets closer to either of the magnetic poles. You should also remember that 
some maps indicate true north (instead of magnetic north), and so you should make allowances when 
using such maps with this watch.
Location
• Taking a direction reading when you are near a source of strong magnetism can cause large errors in 
readings. Because of this, you should avoid taking direction readings while in the vicinity of the 
following types of objects: permanent magnets (magnetic necklaces, etc.), concentrations of metal 
(metal doors, lockers, etc.), high tension wires, aerial wires, household appliances (TVs, personal 
computers, washing machines, freezers, etc.).
• Accurate direction readings are impossible while in a train, boat, air plane, etc.• Accurate readings are also impossible indoors, especially inside ferroconcrete structures. This is 
because the metal framework of such structures picks up magnetism from appliances, etc.
Storage
• The precision of the bearing sensor may deteriorate if the watch becomes magnetized. Because of 
this, you should store the watch away from magnets or any other sources of strong magnetism, 
including: permanent magnets (magnetic necklaces, etc.) and household appliances (TVs, personal 
computers, washing machines, freezers, etc.).
• Whenever you suspect that the watch may have become magnetized, perform the procedure under “To 
perform bidirectional calibration” (page E-37).
E-47
Taking Barometric Pressure and Temperature Readings
This watch uses a pressure sensor to measure air pressure (barometric pressure) and a temperature 
sensor to measure temperature.
To enter and exit the Barometer/Thermometer Mode
1. While in the Timekeeping Mode or in any of the sensor modes, press 
B
 to enter the Barometer/Thermometer Mode.
•BARO will appear on the display, indicating that barometric 
pressure and temperature measurements are in progress. The 
measurement results will appear on the display after about fi ve 
seconds.
• After you press B
, the watch will take readings every fi ve seconds 
for the fi rst three minutes, and then every two minutes after that.
2. Press D
 to return to the Timekeeping Mode.
• The watch will return to the Timekeeping Mode automatically if you 
do not perform any operation for about 24 hours after entering the 
Barometer/ Thermometer Mode.
To take barometric pressure and temperature readings
While in the Timekeeping Mode or in any of the sensor modes, press B
.
• This starts barometric pressure and temperature measurements automatically.• You also can perform a barometric pressure and temperature measurement at any time by pressing B
in the Barometer/Thermometer Mode.
• The barometric pressure change indicator is displayed if there has been signifi cant change in 
barometric pressure. For more information, see “Barometric Pressure Change Indicator” (page E-51).
• It can take up to four or fi ve seconds for the barometric pressure reading to appear after you enter the 
Barometer/Thermometer Mode.
Barometric
pressure graphBarometric
pressure
change
indicator
Barometric
pressurePressure
differential
pointer
TemperatureBarometric
pressure graphBarometric
pressure
change
indicator
Barometric
pressurePressure
differential
pointer
Temperature 
						

							Operation Guide 3258
E-48
Barometric Pressure• Barometric pressure is displayed in units of 1 hPa (or 0.05 inHg).•The displayed barometric pressure value changes to - - -
 if a measured 
barometric pressure falls outside the range of 260 hPa to 1,100 hPa (7.65 
inHg to 32.45 inHg). The barometric pressure value will reappear as 
soon as the measured barometric pressure is within the allowable range.
Temperature• Temperature is displayed in units of 0.1°C (or 0.2°F).• The displayed temperature value changes to - - -
 °C (or °F) if a 
measured temperature falls outside the range of –10.0°C to 60.0°C 
(14.0°F to 140.0°F). The temperature value will reappear as soon as 
the measured temperature is within the allowable range.
Display Units
You can select either hectopascals (hPa) or inchesHg (inHg) as the display unit for the measured 
barometric pressure, and Celsius (°C) or Fahrenheit (°F) as the display unit for the measured temperature 
value. See “To specify temperature, barometric pressure, and altitude units” (page E-70).
Barometric Pressure GraphBarometric pressure indicates changes in the atmosphere. By monitoring 
these changes you can predict the weather with reasonable accuracy. 
This watch takes barometric pressure measurements automatically every 
two hours (at the 30th minute of every even numbered hour). 
Measurement results are used to produce barometric pressure graph and 
barometric pressure differential pointer readings.
Temperature
Barometric pressure 
change indicator
Barometric
pressure
Temperature
Barometric pressure 
change indicator
Barometric
pressure
Barometric pressure graphBarometric pressure graph
E-49
Reading the Barometric Pressure GraphThe barometric pressure graph shows readings of previous measurements for up to 10 hours.• The horizontal axis of the graph represents time, with each dot standing for 
two hours. The rightmost dot represents the most recent reading.
• The vertical axis of the graph represents barometric pressure, with each 
dot standing for the relative difference between its reading and that of the 
dots next to it. Each dot represents 1 hPa.
The following shows how to interpret the data that appears on the barometric pressure graph.
Rising barometric pressure indicates that upcoming weather will improve.
Falling barometric pressure indicates that upcoming weather will deteriorate.
Note
• If there are sudden changes in weather or temperature, the graph line of past 
measurements may run off the top or bottom of the display. The entire graph will 
become visible once barometric conditions stabilize.
• The following conditions cause the barometric pressure measurement to be skipped, 
with the corresponding point on the barometric pressure graph being left blank.
– Barometric reading that is out of range (260 hPa to 1,100 hPa or 7.65 inHg to 32.45 
inHg)
– Sensor malfunction
Barometric
pressure
TimeBarometric
pressure
Time
Not visible on 
the display.
Not visible on 
the display.
E-50
Barometric Pressure Differential PointerThis pointer indicates the relative difference between the most recent 
barometric pressure reading indicated on the barometric pressure graph 
(page E-48), and the current barometric pressure value displayed in the 
Barometer/Thermometer Mode (page E-47).
Reading Barometric Pressure Differential PointerPressure differential is indicated in the range of 
±10 hPa, in 1-hPa units.
• The nearby screen shot, for example, shows 
what the pointer would indicate when the 
calculated pressure differential is 
approximately – 5 hPa (approximately – 0.15 
inHg).
• Barometric pressure is calculated and 
displayed using hPa as the standard. The 
barometric pressure differential also can be 
read in inHg units as shown in the illustration 
(1 hPa 
= 0.03 inHg).
Barometric
pressure
differential
pointerBarometric
pressure
differential
pointer
−0.15 −5
−10
−0.3
Barometric pressure 
differential pointerinHg values
hPa valuesCurrent pressure 
greater than most 
recent measured 
pressure
Current pressure 
less than most 
recent measured 
pressure
−0.15 −5
−10
−0.3
Barometric pressure 
differential pointerinHg values
hPa valuesCurrent pressure 
greater than most 
recent measured 
pressure
Current pressure 
less than most 
recent measured 
pressure
E-51
Barometric Pressure Change IndicatorThe watch analyzes the last 10 hours of barometric pressure. If it determines that there has been a 
signifi cant change in pressure, it displays a barometric pressure change indicator. For example, you can 
start barometric pressure measurement when you arrive at a mountain lodge or campground for the night. 
The following morning you can check for changes and plan your day accordingly.
Reading the Barometric Pressure Change Indicator
Indicator Meaning
Sudden rise in pressure.
Sudden fall in pressure.
Sustained fall in pressure, changing to a rise.
Sustained rise in pressure, changing to a fall.
• The barometric pressure change indicator is not displayed if there has been no noteworthy change in 
barometric pressure.
E-52
Important!• To ensure proper results, take barometric readings under conditions where the altitude remains 
constant.
Example
– In a lodge or campground
– On the ocean
• A change in altitude causes a change in barometric pressure. Because of this, correct readings are 
impossible. Do not take readings while ascending or descending a mountain, etc.
• The barometric pressure change indicator may appear at any time while the watch is in the Barometer/
Thermometer Mode. Keep in mind, however, that its indication will not be correct unless the watch has 
been in an location where there was no change in altitude over the past several hours.
Pressure Sensor and Temperature Sensor CalibrationThe pressure sensor and temperature sensor built into the watch are calibrated at the factory and normally 
require no further adjustment. If you notice serious errors in the pressure readings and temperature 
readings produced by the watch, you can calibrate the sensor to correct the errors.
Important!
• Incorrectly calibrating the barometric pressure sensor can result in incorrect readings. Before 
performing the calibration procedure, compare the readings produced by the watch with those of 
another reliable and accurate barometer.
• Incorrectly calibrating the temperature sensor can result in incorrect readings.
Carefully read the following before doing anything.
–
Compare the readings produced by the watch with those of another reliable and accurate thermometer.– If adjustment is required, remove the watch from your wrist and wait for 20 or 30 minutes to give the 
temperature of the watch time to stabilize.
E-53
To calibrate the pressure sensor and the temperature sensor
1. Take a reading with another measurement device to determine the 
exact current barometric pressure or temperature.
2. With the watch in the Timekeeping Mode or in any of the sensor 
modes, press B
 to enter the Barometer/Thermometer Mode.
3. Hold down E
 until SET Hold
 appears on the display and then the 
current settings start to fl ash.
4. Press D
 to move the fl ashing between the temperature value and 
barometric pressure value, to select the one you want to calibrate.
5. Use 
A
 (+) and C (–) to select the temperature and barometric 
pressure value display units as shown below.
            Temperature                         0.1°C (0.2°F)
            Barometric Pressure             1 hPa (0.05 inHg)
• To return the currently fl ashing value to its initial factory default 
setting, press A
 and C
 at the same time. OFF will appear at 
the fl ashing location for about one second, followed by the initial 
default value.
6. Press E
 to return to the Barometer/Thermometer Mode screen.
E-54
Barometer and Thermometer Precautions• The pressure sensor built into this watch measures changes in air pressure, which you can then apply 
to your own weather predictions. It is not intended for use as a precision instrument in offi cial weather 
prediction or reporting applications.
• Sudden temperature changes can affect pressure sensor readings.• Temperature measurements are affected by your body temperature (while you are wearing the watch), 
direct sunlight, and moisture. To achieve a more accurate temperature measurement, remove the 
watch from your wrist, place it in a well ventilated location out of direct sunlight, and wipe all moisture 
from the case. It takes approximately 20 to 30 minutes for the case of the watch to reach the actual 
surrounding temperature.
E-55
Taking Altitude Readings
The watch displays altitude values based on air pressure readings taken by a built-in pressure sensor.
How the Altimeter Measures AltitudeThe altimeter can measure altitude based on its own preset values (initial default method) or using a 
reference altitude specifi ed by you.
When you measure altitude based on preset values
Data produced by the watch’s barometric pressure sensor is converted to approximate altitude based on 
ISA (International Standard Atmosphere) conversion values stored in watch memory.
When you measure altitude using a reference altitude specifi ed by you
After you specify a reference altitude, the watch uses that value to convert 
barometric pressure readings to altitude (page E-61).
• When mountain climbing, you can specify a reference altitude value in 
accordance with a marker along the way or altitude information from a 
map. After that, the altitude readings produced by the watch will be more 
accurate than they would without a reference altitude value.
400AB400AB 
						

							Operation Guide 3258
E-56
To take an altimeter reading
1. Make sure the watch is in the Timekeeping Mode or any one of the 
sensor modes.
• The sensor modes are: Digital Compass Mode, Barometer/
Thermometer Mode, and Altimeter Mode.
2. Press
A to start Altimeter measurement.•ALTI will appear on the display, indicating that Altimeter 
measurement is in progress. The fi rst reading will appear on the 
display after about four or fi ve seconds.
• The current altitude value is displayed in units of 5 meters (20 feet).• After the fi rst reading is obtained, the watch continues to take 
altimeter readings automatically every fi ve seconds for the fi rst 
three minutes, and then every two minutes after that (under initial 
default settings).
• You can use the procedure under “To select the altitude auto 
measurement method” (page E- 58) to specify the altitude auto 
measurement method you want to use.
3. After you are fi nished using the Altimeter, press
D to return to the 
Timekeeping Mode and stop auto measurement.
• The watch will return to the Timekeeping Mode automatically if you 
do not perform any operation for about 24 hours after entering the 
Altimeter Mode (under initial default settings).
Current time
Current
altitudeAltitude
differentialCurrent time
Current
altitudeAltitude
differential
E-57
Note• The measurement range for altitude is –700 to 10,000 meters (–2,300 to 32,800 feet).• The displayed altitude value changes to - - - -
 if an altitude reading falls outside the measurement 
range. An altitude value will reappear as soon as the altitude reading is within the allowable range.
•Normally, displayed altitude values are based on the watch’s preset conversion values. You also can 
specify a reference altitude value, if you want. See “Specifying a Reference Altitude Value” (page E-61).
• You can change the unit for displayed altitude values to either meters (m) or feet (ft).
See “To specify temperature, barometric pressure, and altitude units” (page E-70).
Selecting an Altitude Auto Measurement MethodYou can select either of the following two altitude auto measurement methods.
        0’05
: Readings at fi ve-second intervals for about one hour
        2’00
: Readings at fi ve-second intervals for the fi rst three minutes followed by two-minute intervals for 
approximately 24 hours
Note
If you do not perform any button operation while in the Altimeter Mode, the watch will return to the 
Timekeeping Mode automatically after 24 hours (altitude auto measurement method: 2’00
) or after one 
hour (altitude auto measurement method: 0’05
).
E-58
To select the altitude auto measurement method
1. In the Altimeter Mode, hold down E
 until SET Hold
 appears on the 
display and then Hold
 disappears. 
2. Press D
 to display the current altitude auto measurement method 
setting.
• This will cause either 0’05 or 2’00 to fl ash on the display.
3. Press A
 to toggle the altitude auto measurement method setting 
between0’05
 and 2’00
.
4. Press E
 to exit the setting screen.
E-59
Using the Altitude Differential ValueThe Altimeter Mode screen includes an altitude differential value that 
shows the change in altitude from a reference point you specify. The 
altitude differential value is updated each time the watch takes an altitude 
reading.
• The range of the altitude differential value is –3,000 meters (–9,980 
feet) to 3,000 meters (9,980 feet).
•- - - -
 is displayed in place of the altitude differential value whenever 
the measured value is outside the allowable range.
• See “Using the Altitude Differential Value While Mountain Climbing or 
Hiking” (page E-60) for some real-life examples of how to use this 
feature.
To specify the altitude differential start point
In the Altimeter Mode, press E
.
• The watch will take an altitude reading and register the result as the 
altitude differential value start point. The altitude differential value will 
be reset to zero at this time.
Altitude differentialAltitude differential
Altitude differentialAltitude differential
E-60
Using the Altitude Differential Value While Mountain Climbing or HikingAfter you specify the altitude differential start point while mountain climbing or hiking, you easily can 
measure the change in the altitude between that point and other points along the way.
To use the altitude differential value
1. In the Altimeter Mode, check to make sure that an altitude reading is 
on the display.
• If an altitude reading is not displayed, press A
 to take one. See “To 
take an altimeter reading” (page E- 56) for details.
2. Use the contour lines on your map to determine the difference in 
altitude between your current location and your destination.
3. In the Altimeter Mode, press E
 to specify your current location as the 
altitude differential start point.
• The watch will take an altitude reading and register the result as 
the altitude differential value start point. The altitude differential 
value will be reset to zero at this time.
4. While comparing the altitude difference you determined on the map 
and the watch’s altitude differential value, advance towards your 
destination.
• If the map shows that the difference in altitude between your 
location and your destination is +80 meters for example, you know 
you will be nearing your destination when the displayed altitude 
differential value shows +80 meters.
Current
location Destination
altitudeCurrent
location Destination
altitude
Altitude
Altitude differential
Altitude
Altitude differential
E-61
Specifying a Reference Altitude ValueThe altitude readings produced by this watch are subject to error caused by changes in air pressure. 
Because of this, we recommend that you update the reference altitude value whenever one is available 
during your climb. After you specify a reference altitude value, the watch adjusts its air-pressure-to-altitude 
conversion calculation accordingly.
To specify a reference altitude value
1. In the Altimeter Mode, hold down E
 until SET Hold
 appears on the 
display and then Hold
 disappears. 
2. Press A
 (+) or C
 (–) to change the current reference altitude value 
by 5 meters (or 20 feet).
• Change the reference altitude value to an accurate altitude reading 
that you get from a map or other source.
• You can set the reference altitude value within the range of –10,0 0 0 
to 10,000 meters (–32,800 to 32,800 feet).
• Pressing A
 and C
 at the same time returns to OFF (no reference 
altitude value), so the watch performs air pressure to altitude 
conversions based on preset data only.
3. Press E
 to exit the setting screen.
E-62
Types of Altitude DataThe watch can maintain two types of altitude data in its memory: manual measurement records, and auto 
save values (low altitude, high altitude, total ascent, total descent).
• Use the Data Recall Mode to view data stored in memory. See “Viewing Altitude Records” (page E-73) 
for details.
Manual Measurement RecordsAny time you perform the procedure below in the Altimeter Mode, the watch will create and store a record 
with the currently displayed altitude reading, along with the date and time the reading was taken. There is 
enough memory to store up to 14 manual measurement records, which are numbered from REC 1
throughREC 14
.
To save a manual measurement
1. In the Altimeter Mode, check to make sure that an altitude reading is 
on the display.
• If an altitude reading is not displayed, press A
 to take one. See “To 
take an altimeter reading” (page E- 56) for details.
2. Hold down A
 until REC Hold
 appears on the display and then 
changes to REC
.
• This will save the currently displayed altitude reading in a manual 
measurement record, along with the measurement time and date.
• The watch will return to the Altimeter Mode screen automatically 
after the save operation is complete.
• There is enough memory to store up to 14 manual measurement 
records. If there are already 14 manual measurement records in 
memory, the above operation will cause the oldest record to be 
deleted automatically to make room for the new one.
E-63
Auto Save ValuesTwo sets of auto save values (Set 1 and Set 2) are maintained in watch memory.Set 1 Set 2
High Altitude (MAX-1
)
Low Altitude (MIN-1
)
Total Ascent (ASC-1
)
Total Descent (DSC-1
)High Altitude (MAX-2
)
Low Altitude (MIN-2
)
Total Ascent (ASC-2
)
Total Descent (DSC-2
)
•These values are checked and updated automatically by the watch as altitude auto measurements are 
taken.
How High and Low Values Are Updated
While the watch is in the Altimeter Mode, altitude readings are taken automatically at the interval specifi ed 
by the altitude auto measurement method (page E-57). With each reading, the watch compares the 
current reading against the MAX
 (MAX-1
 and MAX-2
) (high altitude) and MIN
 (MIN-1
 and MIN-2
) (low 
altitude) values. It will replace the MAX
 value if the current reading is greater than MAX
, or the MIN
 value 
if the current reading is less than MIN
. 
						

							Operation Guide 3258
E-64
How Total Ascent/Descent Values Are Updated
Session start point
20 m
0 m 120 m 320 m 620 m
Session end point
The total ascent and total descent values produced by an Altimeter Mode measurement session during 
the example climb illustrated above are calculated as follows.
  Total Ascent:
q (300 m) + e (620 m) = 920 m
  Total Descent: w (320 m) + r (500 m) = 820 m• Entering the Altimeter Mode starts a new altitude auto measurement session, but it does not reset the 
currentASC
 (ASC-1
 and ASC-2
) and DSC
 (DSC-1
 and DSC-2
) values or change them in any way. 
This means that the starting ASC
 and DSC
 values for a new Altimeter Mode auto measurement session 
are the values that currently are in memory. Each time you complete an Altimeter Mode auto 
measurement session by returning to the Timekeeping Mode, the total ascent value of the current 
session (920 meters in the above example) is added to the session’s starting ASC
 value. Also, the total 
descent value of the current auto measurement session (
–820 meters in the above example) is added 
to the session’s starting DSC
 value.
E-65
• Note that any change in elevation when ascending that is less than 15 meters (49 feet) is not added to 
the total ascent value for the current Altimeter Mode auto measurement session. Also, any change in 
elevation when descending that is less than 
–15 meters (
–49 feet) is not added to the total descent 
value for the current Altimeter Mode auto measurement session.
Note
• The high altitude, low altitude, total ascent, and total descent values are retained in memory when you 
exit the Altimeter Mode. To clear values, perform the procedure under “To clear the contents of a 
specifi c memory area” (page E-76).
Using Auto Save Values
The watch maintains two independent sets of auto save values as shown below.
Set 1 Set 2
High Altitude (MAX-1
)
Low Altitude (MIN-1
)
Total Ascent (ASC-1
)
Total Descent (DSC-1
)High Altitude (MAX-2
)
Low Altitude (MIN-2
)
Total Ascent (ASC-2
)
Total Descent (DSC-2
)
The values in Set 1 and Set 2 can be cleared independently of each other. This means you can use them 
to keep track of daily and cumulative data as described in the example below.
Example:
 Keeping track of data on a three-day climb
Day 1
Clear both Set 1 and Set 2, and start your Day 1 climb.
At the end of the day, both sets of auto save values contain the same data (MAX-1
 = MAX-2
,MIN-1
 = 
MIN-2
, etc.).
E-66
Day 2
Clear only Set 1, and start your Day 2 climb. At the end of the day, the values in Set 1 (MAX-1
,MIN-1
,
ASC-1
,DSC-1
) will show the results of Day 2 only. In Set 2, MAX-2
 and MIN-2
 will show the high 
altitude and low altitude reached over the two-day span. ASC-2
 will show the total ascent for the two 
days (Day 1 + Day 2) and DSC-2
 will show the total descent for the two days.
Day 3
Clear only Set 1, and start your Day 3 climb. At the end of the day, the values in Set 1 will show the 
results of Day 3 only. In Set 2, MAX-2
 and MIN-2
will show the high altitude and low altitude reached 
over the three-day span. ASC-2
 will show the total ascent for the three days (Day 1 + Day 2 + Day 3) 
andDSC-2
 will show the total descent for the three days.
• For details about clearing altitude data, see “To clear the contents of a specifi c memory area” (page E-76).
E-67
How does the altimeter work?Generally, air pressure and temperature decrease as altitude increases. This watch bases its altitude 
measurements on International Standard Atmosphere (ISA) values stipulated by the International Civil 
Aviation Organization (ICAO). These values defi ne relationships between altitude, air pressure, and 
temperature.
0 m500 m 1000 m1500 m 2000 m2500 m 3000 m3500 m 4000 m
899 hPa
795 hPa
701 hPa
616 hPa
8.5°C
2°C
–4.5°C
–11°C
15°C 1013 hPaAbout 6.5°C 
per 1000 m About 8 hPa per 100 m
About 9 hPa per 100 m
About 10 hPa per 100 m
About 11 hPa per 100 m
About 12 hPa per 100 m
Altitude Air Pressure Temperature
0 ft.2000 ft. 4000 ft.6000 ft. 8000 ft.10000 ft. 12000 ft.14000 ft.
25.84 inHg
22.23 inHg
19.03 inHg
44.7°F
30.5°F
16.2°F
59.0°F 29.92 inHgAbout 3.6°F 
per 1000 ft. About 0.15 inHg per 200 ft.
About 0.17 inHg per 200 ft.
About 0.192 inHg per 200 ft.
About 0.21 inHg per 200 ft.
Source:   International Civil Aviation Organization
E-68
• Note that the following conditions will prevent you from obtaining accurate readings:
When air pressure changes because of changes in the weather
Extreme temperature changes
When the watch itself is subjected to strong impact
There are two standard methods of expressing altitude: Absolute altitude and relative altitude. Absolute 
altitude expresses an absolute height above sea level. Relative altitude expresses the difference between 
the height of two different places.
Height of building 130 m 
(relative altitude)Rooftop at an altitude of 
230 m above sea level 
(absolute altitude)
Sea Level
E-69
Altimeter Precautions• This watch estimates altitude based on air pressure. This means that altitude readings for the same 
location may vary if air pressure changes.
• The semiconductor pressure sensor used by the watch for altitude measurements is also affected by 
temperature. When taking altitude measurements, do not subject the watch to temperature changes.
• Do not rely upon this watch for altitude measurements or perform button operations while sky diving, 
hang gliding, or paragliding, while riding a gyrocopter, glider, or any other aircraft, or while engaging in 
any other activity where there is the chance of sudden altitude changes.
• Do not use this watch for measuring altitude in applications that demand professional or industrial level 
precision.
• Remember that the air inside of a commercial aircraft is pressurized. Because of this, the readings 
produced by this watch will not match the altitude readings announced or indicated by the fl ight crew.
E-70
Specifying Temperature, Barometric Pressure, and Altitude Units
Use the procedure below to specify the temperature, barometric pressure, and altitude units to be used in 
the Barometer/Thermometer Mode and the Altimeter Mode.
Important!
WhenTYO
 (Tokyo) is selected as the Home City, the altitude unit is set 
automatically to meters (m
), the barometric pressure unit to hectopascals 
(hPa
), and the temperature unit to Celsius (°C
). These settings cannot be 
changed.
To specify temperature, barometric pressure, and altitude units
1. In the Timekeeping Mode, hold down E
 until SET Hold
 appears on the 
display and then the city code starts to fl ash.
2. Press D
 as many times as necessary until SET
 appears on the display.
• See the sequence in step 2 of the procedure under “To change the 
current time and date settings manually” (page E-32) for information 
about how to scroll through setting screens.
E-71
3. Perform the operations below to specify the units you want.
To specify this unit: Press this key: To toggle between these settings:
AltitudeA
m
 (meters) and ft
 (feet)
Barometric PressureB
hPa
 (hectopascals) and inHg
 (inches of mercury)
TemperatureC
°C
 (Celsius) and °F
 (Fahrenheit)
4. After all of the settings are the way you want, press E
 to exit the setting screen.• To return to the screen in step 1, press E
 again. 
						

							Operation Guide 3258
E-72
Precautions Concerning Simultaneous Measurement of Altitude and Temperature
Though you can perform altitude and temperature measurements at the same time, you should remember 
that each of these measurements requires different conditions for best results. With temperature 
measurement, it is best to remove the watch from your wrist in order to eliminate the effects of body heat. 
In the case of altitude measurement, on the other hand, it is better to leave the watch on your wrist, 
because doing so keeps the watch at a constant temperature, which contributes to more accurate altitude 
measurements.
• To give altitude measurement priority, leave the watch on your wrist or in any other location where the 
temperature of the watch is kept constant.
• To give temperature measurement priority, remove the watch from your wrist and allow it to hang freely 
from your bag or in another location where it is not exposed to direct sunlight. Note that removing the 
watch from your wrist can affect pressure sensor readings momentarily.
E-73
Viewing Altitude Records
Use the Data Recall Mode to view manual saved altitude readings and automatically saved high altitude, 
low altitude, total ascent, and total descent values. Altitude data records are created and saved in the 
Altimeter Mode.
To view altitude records
1. Use D
 to select the Data Recall Mode (REC
) as shown on page E-24.
• About one second after REC appears on the display, the display 
will change to show the fi rst record of the memory area you were 
viewing when you last exited the Data Recall Mode.
2. Use B
 to select the memory area you want.
REC 1(Manually Saved 
Record Area)(Auto Save 
Value Area 1)MAX 1(Auto Save 
Value Area 2)MAX 2
Reading time 
(Hour : minute)
Reading date 
(month, day)
Record number
Reading time 
(Hour : minute)
Reading date 
(month, day)
Record number
E-74
3. Use A
 and C
 to scroll through the screens for an area and display the one you want.
REC
1REC
2REC
14
Manually saved records
MAX MIN ASC DSC
Auto saved values
• Records of manually saved altitude values (REC 1 through REC 14) and the MAX and MIN
automatically saved altitude values include the date (month, day) and time (hour, minute) that the 
data was recorded.
AltitudeAltitude
AltitudeAltitude
E-75
• Records of the ASC and DSC automatically save altitude values include the date (month, day) and 
year that the data was recorded.
• For detailed information about auto saved values, see “Auto Save Values” (page E- 63).
4. After you are fi nished viewing data, use D
 to exit the Data Recall Mode.
•---- will be displayed if data has been deleted or if there is no corresponding data due to error, etc. 
In such cases, total ascent (ASC) and total descent (DSC) values will show zero.
• When the total ascent (ASC) or total descent (DSC) exceeds 99,995 meters (or 327,980 feet), the 
applicable value will restart from zero.
• When the total ascent (ASC) or total descent (DSC) value 
becomes fi ve digits long, the rightmost (ones) digit is shown in the 
lower right of the display. The nearby illustration shows the display 
when the value of ASC-1 is 99995 meters.
1s digit 10,000s digit1s digit 10,000s digit
E-76
To clear the contents of a specifi c memory area
1. Use D
 to enter the Data Recall Mode.
2. Use B
 to select the memory area you want to clear.
• Note that the contents of the memory area you select will be 
deleted as soon as you perform step 3 below. The clear operation 
cannot be undone, so double check to make sure you really want 
to delete the contents of the memory area you select here.
3. Hold down E
 until CLR Hold appears on the display and then Hold
disappears.
• This deletes the record you displayed in step 2.• Release E
 after CLR appears on the display.
E-77
Viewing Tide and Moon Data
The Tide/Moon Data Mode shows tide and Moon information for the Home City you selected in the 
Timekeeping Mode.
• See “Moon Phase Indicator” (page E-82) for information about the moon phase indicator and “Tide 
Graph” (page E-84) for information about the tide graph.
• All of the operations in this section are performed in the Tide/Moon Data Mode (page E-24).
Note
• It takes about two seconds to calculate tide graph data. You will not be able to display a setting screen 
while data calculation is in progress.
• Moon age is calculated to an accuracy of ±1 day.
Tide DataThe Tide Graph that appears fi rst when you enter the Tide/Moon Data Mode shows the data at 6:00 a.m. 
for your currently selected Home City (tide site) on the current date, according to the Timekeeping Mode. 
From there you can specify another time on the same date.
• If the tide data is not correct, check your Timekeeping Mode settings and correct them if necessary.• If you feel that the information shown by the Tide Graph is different from actual tide conditions, you 
need to adjust the high tide time. See “Adjusting the High Tide Time” (page E-80) for more information.
E-78
Moon DataThe Moon phase and Moon age information that appears fi rst when you enter the Tide/Moon Data Mode 
shows the data at noon for your currently selected Home City on the current date, according to the 
Timekeeping Mode. After that you can specify another date to view data.
• If the Moon data is not correct, check your Timekeeping Mode settings and correct them if necessary.• If the Moon phase indicator shows a phase that is a mirror image of the actual Moon phase in your 
area, you can use the procedure under “Reversing the Displayed Moon Phase” (page E-81) to change 
it.
To enter the Tide/Moon Data Mode
UseD
 to select the Tide/Moon Data Mode (TIDE
) as shown on page 
E-24.
• After about one second, TIDE
 appears on the display, the display will 
change to show the moon age.
E-79
To view Moon Data for a particular date, or Tide Data for a particular date and time
1. In the Tide/Moon Data Mode, use A
 (+) and C
 (–) to scroll to the 
date whose tide and Moon information you want to view.
• After you select a date, the watch starts to calculate Moon and tide 
data for the date you selected. The calculation operation takes 
about two seconds, and is indicated by movement in the Moon 
Phase indicator and the Tide Graph on the display. You can use 
A
 and C
 to change to another date while a calculation operation 
is in progress.
• After calculation is complete, the Moon information (Moon age and 
phase) and tide information (current tide level and tide range) will 
be displayed for the date you selected.
2. While the Moon information (Moon age and phase) and tide information 
(tide level and tide range for the current date) are displayed, you can 
pressB
 (+) to advance the displayed tide range by one hour.
• You also can use A
 (+) and C
 (–) to change the date.• Update of the Moon Phase indicator and the Tide Graph is 
stopped while any of the following is occurring.
During button operation
While an alarm is sounding
While a countdown beeper is sounding
During display illumination
During Auto Receive of a time calibration signal
During a 2-hour barometric pressure reading operation
Moon ageMoon phase
Current tide 
rangeCurrent
tide levelMoon ageMoon phase
Current tide 
rangeCurrent
tide level