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Screen Backlighting
The GPS 125 Sounder features three levels of back-
lighting. Activate the backlight by pressing the POWER
key briefly. Each press of the button advances the back-
lighting to the next level and then turns it off.
Backlighting will remain on until turned off.
Position Page
The GPS 125 Sounder’s Position Page shows you
where you are, the direction you are heading, and your
speed (up to 99.9 mph), and is most useful when you
are traveling without an active destination waypoint. A
compass tape at the top of the page displays your cardi-
nal heading (while moving), with 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 user-selec-
table through the navigation setup menu (see pg. 53).
The 12/24-hour clock and time offset options are avail-
able from the system setup menu (see pg. 52).
Trip Odometer
The Position Page also features a resettable trip
odometer to measure your total distance traveled.
To reset the trip odometer:
1. Press the
D
key until the trip field is highlighted.
2. Press
F
,
followed by
L
.
3. Press
F
to finish.
Altitude Display
When the GPS 125 Sounder is acquiring satellites or
navigating in the 2D mode, the last known altitude will
be used to compute your position. If the altitude shown
is off by several hundred feet, you can manually enter
your altitude for greater accuracy. Note that GPS alti-
tudes can fluxuate due to errors.
To enter an altitude:
1. Press the
D
key until the altitude field is highlighted
and press
F
.
2. Use the arrow keypad to enter the altitude and press
F
.
Backlighting &
Position Page
REFERENCE
20
The speed and track dis-
played on the Position Page
may fluxuate at slow speeds
(or when you’re standing
still) because of position
errors caused by Selective
Availability.
To reset the trip odometer,
highlight the trip field and
press ENTER. Use the
LEFT arrow key to clear the
distance field, and press
ENTER to confirm.
125 Man Rev B 7/23/98 11:47 AM Page 20