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Position Page
The GPS 38’s Position Page shows you where you are,
what direction you’re heading and how fast you are going
(up to 99.9 mph), and is most useful when you are travel-
ing without an active destination waypoint. A graphic com-
pass tape at the top of the page displays your cardinal head-
ing (while you’re moving), with your current track and
speed over the ground indicated below. The rest of the page
shows your present position in three dimensions (latitude,
longitude and altitude). The units of measure for speed,
distance, position and altitude are all user-selectable
through the navigation setup menu (see page 48). The
12/24 hour clock and time offset options are available from
the system setup menu (see page 46).
Trip Odometer
The Position Page also features a resettable trip odome-
ter to measure the total distance traveled while navigating.
To reset the trip odometer:
1. Highlight the ‘TRIP’ field.
2. Press
E
, followed by
L
.
3. Press
E
to finish.
Altitude Display
When the GPS 38 is acquiring satellites or navigating in
the 2D mode, the last known altitude will be used to com-
pute your position. If the altitude shown is off by several
hundred feet, you can manually enter your altitude for
greater accuracy. Note that GPS altitudes can fluxuate due
to errors.
1. Highlight the ‘ALT’ field.
2. Press
E
to begin entry of your altitude.
3. Enter a value in each character field.
4. Press the
E
key to confirm the altitude.
The speed displayed on the
Position Page may fluctuate
at slow speeds (or when
y o u ’ re standing still)
because of position errors
caused by Selective
Availability.
To reset the trip odometer,
highlight the trip field and
p ress ENTER. Use the
LEFT arrow key to clear the
distance field and pre s s
ENTER to confirm.
R E F E R E N C E
Position Page
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GPS 38 Man Rev B 7/23/98 4:32 PM Page 20