Garmin 740 S Owners Manual

							GPSMAP 700 Series Owner’s Manual 77
Sonar 
Adjusting the Range of the Depth Scale
You can adjust the range of the depth scale that appears on the right side of the screen.
1. From the Home screen, select  Sonar.
2.  Select a sonar view.
3.  Select  Menu > Range.
4.  Complete an action:
• Select  Auto to allow the chartplotter to adjust the depth scale automatically .
•  Select  Up or Down to increase or decrease the range of the depth scale manually.
5.  Select  Done.
NoTe: From the sonar screen, you can press 
 or  to manually adjust the range of the depth 
scale.
Sonar Alarms
Setting the Shallow Water and Deep Water Alarms
1.  From the Home screen, select  Configure > Alarms > Sonar.
2.  Select  Shallow Water > on to set an alarm to sound when the depth is less than the specified value.
3.  Enter the depth that triggers the shallow water alarm.
4.  Select  Done.
5.  Select  Deep Water > on to set an alarm to sound when the depth is greater than the specified value. 
6.  Enter the depth that triggers the deep water alarm.
7.  Select  Done.
Setting the Water Temperature Alarm
You can set an alarm to sound when the transducer reports a temperature that is 2°F (1.1°C) above or below 
the specified temperature.
1. From the Home screen, select  Configure > Alarms > Sonar > Water Temp > on.
2.  Enter a water temperature.
3.  Select  Done.
Setting the Fish Alarm
You can set an alarm to sound when the chartplotter detects a suspended target of the specified symbols.
1. From the Home screen, select  Configure > Alarms > Sonar > Fish.
2.  Complete an action:
• Select 
 to sound an alarm for all fish sizes.
•  Select 
 to sound an alarm for medium and large fish only.
•  Select 
 to sound an alarm for large fish only. 
						

							78 GPSMAP 700 Series Owner’s Manual
Sonar
Transducer Configuration
Setting the Keel Offset
The keel offset compensates for the surface reading for the depth of a keel, making it possible to measure 
depth from the bottom of the keel instead of from the transducer location. Enter a positive number to of fset for 
a keel. You can enter a negative number to compensate for a large vessel that may draw several feet of water.
1.  Complete an action, based on the location of the transducer:
• If the transducer is installed at the water line 
➊, measure the distance from the transducer location to 
the keel of the boat. Enter this value in step 3 as a positive number .
•  If the transducer is installed at the bottom of the keel 
➋, measure the distance from the transducer to the 
water line. Enter this value in step 3 as a negative number.
Keel Offset
➊
➋
2.  From the Home screen, select  Configure > My Boat > Keel offset .
3.  Enter the distance measured in step 1. Ensure that you enter a positive or a negative number based on the 
location of the transducer.
4.  Select  Done.
Setting the Water Temperature Offset
You must have a NMEA 0183 water-temperature sensor or a temperature-capable transducer to measure water 
temperature.
The temperature offset compensates for the temperature reading from a temperature sensor. 
1. Measure the water temperature using the temperature sensor or temperature-capable transducer that is 
connected to the chartplotter.
2.  Measure the water temperature using a different temperature sensor or a thermometer that is known to be 
accurate.
3.  Subtract the water temperature measured in step 1 from the water temperature measured in   
step 2. 
This is the temperature offset. Enter this value in step 5 as a positive number if the sensor connected to the 
chartplotter measures the water temperature as being colder than it actually is. Enter this value in step 5 
as a negative number if the sensor connected to the chartplotter measures the water temperature as being 
warmer than it actually is.
4.  From the Home screen, select  Configure > My Boat > Temp offset.
5.  Enter the temperature offset calculated in step 3.
6.  Select  Done. 
						

							GPSMAP 700 Series Owner’s Manual 79
Digital Selective Calling 
Digital Selective Calling
Chartplotter and VHF Radio Functionality
The following table indicates the features that are available when you connect your chartplotter to a VHF radio 
over a NMEA 0183 network or a NMEA 2000 network.
Functionality NMEA 0183 
VHF RadioNMEA 2000 
VHF RadioGarmin NMEA 
0183 VHF 
RadioGarmin NMEA 
2000 VHF 
Radio
The chartplotter can transfer your GPS 
position to your radio. If your radio is 
capable, GPS position information is 
transmitted with DSC calls. X
XXX
The chartplotter can receive DSC distress 
and position information from the radio 
(page 80) X
XXX
The chartplotter can track the positions  
of vessels sending position reports  
(page 81). X
XXX
The chartplotter allows you to quickly set 
up and send individual routine call details 
to your Garmin VHF radio  
(page 83). X
When you initiate a man-overboard 
distress call from your radio, the 
chartplotter shows the man-overboard 
screen and prompts you to navigate to the 
man-overboard point (page 80). X
When you initiate a man-overboard 
distress call from your chartplotter, the 
radio shows the Distress Call page to 
initiate a man-overboard distress call 
(page 80). X
Turning On DSC
 
From the Home screen, select  Configure > other Vessels > DSC > on.
About the DSC List
The DSC list is a log of the most-recent DSC calls and other DSC contacts you have entered.  The DSC list 
can contain up to 100 entries. The DSC list shows the most-recent call from a boat. If a second call is received 
from the same boat, it replaces the first call in the call list.
Viewing the DSC List
Your chartplotter must be connected to a VHF radio that supports DSC in order to view the DSC list.
From the Home screen, select  Information > other Vessels > DSC List. 
						

							80 GPSMAP 700 Series Owner’s Manual
Digital Selective Calling
Adding a DSC Contact
You can add a vessel to your DSC list. You can make calls to a DSC contact from the chartplotter ( page 83). 
1.  From the Home screen, select  Information > other Vessels > DSC List > Add Contact .
2.  Enter the Maritime Mobile Service Identity (MMSI) of the vessel.
3.  Select  Done.
4.  Enter the name of the vessel.
5.  Select  Done.
Incoming Distress Calls
If your Garmin chartplotter and VHF radio are connected using NMEA 0183 or NMEA 2000, your chartplotter 
alerts you when your VHF radio receives a DSC distress call. If position information was sent with the distress 
call, that information is also available and recorded with the call.
The 
 symbol designates a distress call in the DSC list and marks the position of the vessel on the 
Navigation chart at the time when the DSC distress call was sent.
Viewing the DSC Distress Call Report
See “Viewing a Position Report” ( page 81).
Calling a Vessel in Distress
See “Making an Individual Routine Call” ( page 83).
Navigating to a Vessel in Distress
The  symbol designates a distress call in the DSC list and marks the position of a vessel on the Navigation 
chart at the time a DSC distress call is sent.
See “Navigating to a Tracked Vessel” (page 81).
Creating a Waypoint at the Position of a Vessel in Distress
See “Creating a Waypoint at the Position of a Tracked Vessel” (page 81).
Editing Information in a DSC Call Report
See “Editing Information in a Position Report” ( page 81).
Deleting a DSC Call Report
See “Deleting a Position Report” (page 81).
Man-Overboard Distress Calls Initiated from a VHF Radio
When your Garmin chartplotter is connected to a Garmin NMEA 2000-compatible radio, and you initiate a 
man-overboard DSC distress call from your radio, your Garmin chartplotter shows the man-overboard screen 
and prompts you to navigate to the man-overboard point. If you have a Garmin autopilot system connected to 
the network, your chartplotter prompts you to start a Williamson’s turn to the man-overboard point.
If you cancel the man-overboard distress call on the radio, the chartplotter screen prompting you to activate 
navigation to the man-overboard location disappears.
Man-Overboard Distress Calls Initiated from the Chartplotter
When your Garmin chartplotter is connected to a Garmin NMEA 2000-compatible radio and you activate 
navigation to a man-overboard location, the radio shows the Distress Call page so you can quickly initiate a 
man-overboard distress call.
On the radio, press the DISTReSS key for at least three seconds to send the distress call.
For information on placing distress calls from your radio, see your Garmin  VHF Radio Owner’s Manual. You 
can mark an  MOB and navigate to it ( page 27). 
						

							GPSMAP 700 Series Owner’s Manual 81
Digital Selective Calling 
Position Tracking
When you connect your Garmin chartplotter to a VHF radio using NMEA 0183, you can track vessels that 
send position reports. This feature is also available with NMEA 2000, provided that the vessel sends the 
correct PGN data (PGN 129808; DSC Call Information).
Every position-report call received is logged in the DSC list (page 79).
Viewing a Position Report
1. From the Home screen, select  Information > other Vessels > DSC List.
2.  Select a position-report call.
3.  Select 
 or  to switch between details of the position report and a Navigation chart marking 
the location.
Calling a Tracked Vessel
See “Making an Individual Routine Call” ( page 83).
Navigating to a Tracked Vessel
1. From the Home screen, select  Information > other Vessels > DSC List.
2.  Select a position-report call.
3.  Select  Navigate To.
4.  Select  Go To or Route To (page 25).
Creating a Waypoint at the Position of a Tracked Vessel
1. From the Home screen, select  Information > other Vessels > DSC List.
2.  Select a position-report call.
3.  Select  Create Waypoint.
Editing Information in a Position Report
1. From the Home screen, select  Information > other Vessels > DSC List.
2.  Select a position-report call.
3.  Select  edit.
4.  Complete an action:
• Select  Name. Enter the name of the vessel. Select  Done.
•  Select  Symbol. Select a new symbol. Select  Done.
•  Select  Comment. Enter the comment. Select  Done.
•  Select  Trail > Show to show a trail line for the vessel, if your radio is tracking the position of the 
vessel.
•  Select  Trail Line . Select a color for the trail line.
Deleting a Position-Report Call
1. From the Home screen, select  Information > other Vessels > DSC List.
2.  Select a position-report call.
3.  Select  Clear Report. 
						

							82 GPSMAP 700 Series Owner’s Manual
Digital Selective Calling
Vessel Trails on the Navigation Chart
You can view trails for all tracked vessels on the Navigation chart, the Fishing chart, and the Mariner’s Eye 3D 
chart view. By default, a black dot 
➊ appears for each previously reported position of a tracked vessel, and a 
Blue Flag symbol 
➋ indicates the last reported position of the vessel. A black line ➌ indicating the path of the 
vessel also appears. 
You must enable the DSC Trails setting in order to view trails for tracked vessels ( page 82).
NoTe: The Mariner’s Eye 3D chart is available if you use a BlueChart g2  Vision SD card. The Fishing chart 
is available if you use a BlueChart g2  Vision SD card or a BlueChart g2 SD card, or if your built-in map 
supports Fishing charts.
➊
Vessel Trail on the Navigation Chart
➌
➋
Showing and Setting the Duration of Trails for All Tracked Vessels
NoTe: The Mariner’s Eye 3D chart is available if you use a BlueChart g2  Vision SD card. The Fishing chart 
is available if you use a BlueChart g2  Vision SD card or a BlueChart g2 SD card, or if your built-in map 
supports Fishing charts.
1.  From the Home screen, select  Charts.
2.   Select  Navigation Chart, Fishing Chart, Perspective 3D , or Mariner’s eye 3D.
3.  Select  Menu > other Vessels > DSC Trails.
4.  Select the number of hours to show tracked vessels on the chart or 3D chart view . 
For example, if you select  4 Hours, all trail points that are less than four hours old appear for all tracked 
vessels.
Showing the Trail Line for a Tracked Vessel
You can show the trail line for a specific tracked vessel.
NoTe: The Mariner’s Eye 3D chart is available if you use a BlueChart g2  Vision SD card. The Fishing chart 
is available if you use a BlueChart g2  Vision SD card or a BlueChart g2 SD card, or if your built-in map 
supports Fishing charts.
1.  From the Home screen, select  Charts.
2.   Select  Navigation Chart, Fishing Chart, Perspective 3D , or Mariner’s eye 3D.
3.  Select  Menu > other Vessels > DSC List.
4.  Select a vessel.
5.  Select  edit > Trail  > Show. 
						

							GPSMAP 700 Series Owner’s Manual 83
Digital Selective Calling 
Changing the Appearance of a Trail Line
You can change the appearance of a trail line for a specific tracked vessel.
NoTe: The Mariner’s Eye 3D chart is available if you use a BlueChart g2 Vision SD card. The Fishing chart 
is available if you use a BlueChart g2  Vision SD card or a BlueChart g2 SD card, or if your built-in map 
supports Fishing charts.
1.  From the Home screen, select  Charts.
2.   Select  Navigation Chart, Fishing Chart, Perspective 3D , or Mariner’s eye 3D.
3.  Select  Menu > other Vessels > DSC List.
4.  Select a vessel.
5.  Select  Review > edit > Trail Line .
6.  Select a color for the trail line.
Individual Routine Calls
When you connect your Garmin chartplotter to a Garmin VHF NMEA 2000-compatible radio, you can use 
the chartplotter interface to set up an individual routine call.  When setting up an individual routine call from 
your chartplotter, you can select the DSC channel on which you want to communicate ( page 83). The radio 
transmits this request with your call.
Selecting a DSC Channel
NoTe: The selection of a DSC channel is limited to those channels that are available in all frequency bands: 
6, 8, 9, 10, 13, 15, 16, 17, 67, 68, 69, 71, 72, 73, or 77. The default channel is 72. If you select a different 
channel, the chartplotter uses that channel for subsequent calls until you call using another channel.
1.  From the Home screen, select  Information > other Vessels > DSC List.
2.  Select a vessel or a station to call.
3.  Select  Call with Radio > Channel.
4.  Select a channel.
Making an Individual Routine Call
NoTe: When initiating a call from the chartplotter, if the radio does not have an MMSI number programmed, 
the radio will not receive call information.
1. From the Home screen, select  Information > other Vessels > DSC List.
2.  Select a vessel or a station to call.
3.  Select  Call with Radio > Send.
The chartplotter sends information about the call to the radio.
4.  On your Garmin VHF radio, select  Call.
Making an Individual Routine Call to an AIS Target
When you connect your Garmin chartplotter to a Garmin VHF NMEA 2000-compatible radio, you can use 
the chartplotter interface to set up an individual routine call to an  AIS target. Before you start the call, you can 
select a DSC channel other than the default channel, channel 72 ( page 83).
1.  From the Home screen, select  Charts.
2.  Select a chart or a 3D chart view.
3.  Touch an AIS target 
.
4.  Select  AIS Vessel > Call with Radio > Send.
The chartplotter sends information about the call to the radio.
5.  On your Garmin VHF radio, select  Call. 
						

							84 GPSMAP 700 Series Owner’s Manual
Appendix
Appendix
Specifications
Physical Specifications
SpecificationMeasurement
Size W × H × D: 8 
29/32 × 5 19/32 × 3 1/8 in. (226 × 142 × 80 mm)
Weight 2.48 lb. (1.125 kg)
Display W × H: 6 × 3 
19/32 in. (152 × 91 mm)
Case Fully gasketed, high-impact plastic and aluminum alloy, waterproof to IEC 60529 IPX-7
Temp. Range From 5°F to 131°F (from -15°C to 55°C)
Compass Safe 
Distance 32.0 in. (813 mm)
GPS Performance
Specification
ParameterMeasurement
Receiver High-sensitivity 12 parallel channel, WAAS-capable receiver
Acquisition 
Time Warm
Approximately 1 sec. (The device is at or near the last location at which you 
recently acquired satellites.)
Cold Approximately 38 sec. (The device has moved more than about 500 mi. 
[800 km] since it was turned off.)
Reacquisition < 1 sec.
Update Rate 1/sec., continuous
Accuracy GPS
						

							GPSMAP 700 Series Owner’s Manual 85
Appendix 
Screenshots
You can capture as a bitmap (.BMP) file a screenshot of any screen shown on your chartplotter, and transfer 
the file to your computer.
Capturing Screenshots
1. Insert a memory card into the SD card slot on the front of the chartplotter . 
2.  Select  Configure > System > Beeper/Display  > Screenshot Capture > on.
3.  Go to a screen you want to capture.
4.  Press HoMe  for at least six seconds.
The Screenshot Taken window appears.
5.  Select  oK.
Copying Screenshots to a Computer
1. Remove the memory card from the chartplotter and insert it into an SD card reader that is attached to a 
computer.
2.  From Windows Explorer, open the Garmin\scrn folder on the memory card.
3.  Copy a .BMP file from the card and paste it to any location on the computer.
Viewing GPS Satellite Locations
You can view the relative position of GPS satellites in the sky.
From the Home screen, select  Configure > System > GPS > Skyview.
Using WAAS/EGNOS
WAAS (in North America) or EGNOS (in Europe) can provide more-accurate GPS position information. 
However, when using WAAS or EGNOS, the device takes longer to acquire satellites.
From the Home screen, select  Configure > System > WAAS/eGNoS > oN.
System Information
Viewing System Information
See “Viewing System Information” ( page 3).
Viewing the Event Log
The event log shows a list of system events.
From the Home screen, select  Configure > System > System Information > event Log.
Saving System Information to a Memory Card
You can save system information to a memory card as a troubleshooting tool. A Garmin Product Support 
representative may ask you to use this information to retrieve data about the network.
1. Insert a memory card into the SD card slot on the chartplotter. 
2.  Select  Configure > System > System Information > Garmin Devices  > Save to Card.
3.  Remove the memory card. 
						

							86 GPSMAP 700 Series Owner’s Manual
Appendix
Restoring the Original Chartplotter Factory Settings
NoTe: This procedure deletes all settings information you have entered.
1. From the Home screen, select  Configure > System > System Information > Factory Settings.
2.  Select  Yes.
NMEA 0183 and NMEA 2000
A GPSMAP 700 series chartplotter can accept data from both NMEA 0183-compliant devices and certain 
NMEA 2000 devices connected to an existing NMEA 2000 network on your boat.
NMEA 0183
The NMEA 0183 data cable included with each GPSMAP 700 series chartplotter supports the NMEA 
0183 standard, which is used to wire various NMEA 0183-compliant devices, such as VHF radios, NMEA 
instruments, autopilots, wind sensors, and heading sensors.
To wire the GPSMAP 700 series chartplotter to optional NMEA 0183-compliant devices, see the  GPSMAP 
700 Series Installation Instructions .
Approved NMEA 0183 Sentences
GPAPB, GPBOD, GPBWC, GPGGA, GPGLL, GPGSA, GPGSV, GPRMB, GPRMC, GPRTE, GPVTG, 
GPWPL, GPXTE, and Garmin proprietary sentences   PGRME, PGRMM, and PGRMZ.
This chartplotter also includes support for the WPL sentence, DSC, and sonar NMEA 0183 input with support 
for the DPT (depth) or DBT, MTW (water temp), and VHW (water temp, speed, and heading) sentences.
Configuring NMEA 0183 Output Sentences
You can configure how the chartplotter sees NMEA 0183 output sentences.
1.  From the Home screen, select  Configure > Communications > NMeA 0183 Setup.
2.  Select a setting:  Route, System, Garmin, or Sounder.
3.  Select one or more NMEA 0183 output sentences.
4.  Repeat steps 2 and 3 to configure additional settings.
Setting the Communication Format for Each NMEA 0183 Port 
You can configure the input/output format for each port to use when connecting your chartplotter to external 
NMEA devices, a computer, or other Garmin devices.
1. From the Home screen, select  Configure > Communications > NMeA 0183 Setup.
2.  Complete an action:
• Select  Serial Port 1 .
•  Select  Serial Port 2 .
3.  Select an input/output format:
• Select  Garmin Data Transfer to support the input or output of Garmin-proprietary data for interfacing 
with Garmin software.
•  Select  NMeA Std. to support the input or output of standard NMEA 0183 data, DSC, and sonar NMEA 
input support for the DPT, MTW, and VHW sentences.
•  Select  NMeA High Speed to support the input or output of standard 0183 data for most AIS receivers.
Setting Decimal Precision for NMEA 0183 Output
You can adjust the number of digits to the right of the decimal point for transmission of NMEA output.
1. From the Home screen, select  Configure > Communications > NMeA 0183 Setup > Posn. Precision.
2.  Select  Two Digits, Three Digits, or Four Digits.