Garmin 3 Plus Manual

            4. A city symbol is assigned to the new waypoint, but let’s use a special symbol to identify 
it. Highlight the waypoint symbol field, using the rocker keypad, and press ENTER. Use 
UP/DOWN on the rocker keypad to select the ‘Information’ icon (‘?’) and press ENTER.
            5. To save the new waypoint, highlight ‘Done’ with the rocker keypad and press ENTER.
Now that we’ve created our new waypoint (also see pg. 47), let’s see how the GPS 
III+ is used to navigate to it. The reference...

To mark your present position:
       
1.  Press and hold the ENTER/MARK key. The Mark Waypoint Page will appear, with a 
default three-digit name for the new waypoint in the upper-left portion of the page.
Let’s  call  our  present  position  ‘HOME’.  (If  you  were  at  home  when  you 
initialized  your  GPS  III+,  you  might  want  to  keep  this  waypoint  in  memory  for 
future use!)
  To rename the waypoint and change its symbol:
       
1. Use the keypad to highlight the name field, and press...

Notice  the  information  on  the  map  display  is  slowly  moving?  That’s  how  it  would 
look in actual use as well. The background map information and nearby waypoints will 
move across the screen, while your current position remains fixed in the center.
The  other  primary  navigation  screens  are  the  Compass  and  Highway  pages,  with 
the Compass Page appearing first in the sequence of main pages. 
To view the Compass Page, press PAGE.
The  GPS  III+’s  Compass  Page  provides  graphic...

To view the Highway Page, press PAGE.
The  Highway  Page  provides  a  graphic  highway  display  that  shows  your 
movement relative to the desired course. The line down the middle of the highway 
represents  your  desired  course.  As  you  navigate  toward  your  destination,  the 
highway  will  actually  move,  indicating  the  direction  you’re  off  course.  To  stay 
on  course,  simply  steer  toward  the  center  of  the  highway.  As  you  approach  the 
waypoint, the highway will end at the...

The GPS III+’s Satellite Status Page provides a visual reference of various receiver 
functions, including current satellite coverage, receiver operating mode, battery level 
and position accuracy. As the receiver locks onto satellites, a signal strength bar 
will appear for each satellite in view, with the appropriate satellite number (01-32) 
underneath each bar. The progress of satellite acquisition is shown in three stages:
•  No signal strength bars— the receiver is looking for the satellites...

You  can  use  the  sky  view  to  help  determine  if  any  satellites  are  being  blocked, 
and  whether  you  have  a  current  position  fix  (indicated  by  a  ‘2D  Navigation’  or  ‘3D 
Navigation’ in the status field). You can also set the sky view to a ‘Track Up’ configuration, 
causing the top of the sky view to align along your current track heading.
When  the  receiver  is  looking  for  a  particular  satellite,  the  corresponding  signal 
strength  bar  will  be  blank  and  the  sky  view...

  Poor  GPS  Coverage—  the  receiver  isn’t  tracking  enough  satellites  for  a  2D  or 
3D fix due to bad satellite geometry.
  Not  Usable—  the  receiver  is  unusable,  possibly  due  to  incorrect  initialization 
or  abnormal  satellite  conditions.  Turn  the  unit  off  and  back  on  to  reset,  and 
reinitialize the receiver if necessary.
  Simulating Nav— the receiver is in simulator mode.
‘Need to Select Initialization’ Prompt
If  no  satellites  are  received  for  several  minutes  (or...

‘AutoLocate’ forces the receiv-
er to search for all satellites 
(twelve at a time) until 
enough satellites are found to 
determine a position.
EPE and DOP
The  Satellite  Status  Page  also  indicates  the  accuracy  of  the  position  fix,  using 
Estimated  Position  Error  (EPE)  and  Dilution  of  Precision  (DOP)  figures.  DOP 
measures satellite geometry quality (i.e., number of satellites received and where they 
are relative to each other) on a scale from one to ten. The lowest numbers are the...

With 2D coverage, you will 
need to enter your approx-
imate altitude. Without an 
approximate altitude, your 
position error can be sub-
stantial.
  AutoLocate—  forces  the  GPS  III+  to  search  for  any  available  satellite(s)  to 
determine  its  position.  This  option  is  useful  if  you’ve  relocated  a  long  distance 
(>500 miles) from the last location the GPS III+ was used.
To select AutoLocate, highlight ‘AutoLocate’ and press ENTER.
Initialize Position— allows you to designate your...

The Position Page shows you 
where you are, what direction 
you’re heading and how fast 
you’re going.
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REFERENCE  Contrast and Backlighting
On  page  25,  we  introduced  display  contrast  and  backlighting  adjustments 
accessible from the Satellite Status Page. Display settings can also be adjusted from any 
page, by pressing the red power key. When backlighting is on, a bulb icon will appear 
on the Satellite Status Page, to the bottom left of the sky view. To adjust the duration 
of the screen...