Garmin GPS III Plus - Manual (Page 39)

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 approximate position in order
to speed up satellite acquisition. This option may be used in lieu of ‘AutoLocate’,
above.
To initialize your starting position:
1. Highlight ‘Initialize Position’ and press ENTER.
2. Designate your approximate position on the map using the rocker keypad and press
ENTER. (You may wish to use the IN/OUT zoom keys to adjust the level of detail
displayed, as you determine your approximate position.)
Set 2D Altitude— allows you to designate your approximate altitude, when the
GPS III+ is acquiring satellites or navigating in 2D mode. By default, 2D naviga-
tion will attempt to use the last known altitude. If the altitude shown is off by
several hundred feet (or more), manually entering your approximate altitude will
enable the receiver to more accurately determine a position fix.
To enter an altitude:
1. Highlight ‘Set 2D Altitude’ and press ENTER.
2. Enter your approximate altitude using the rocker keypad, and press ENTER.
‘Initialize Position’ is used to
designate your approximate
position directly on the map
display. The receiver uses
this information to determine
which satellites should be in
view.
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REFERENCE
Satellite Status Page Options