Garmin GPS 90 - Manual (Page 51)

The GPS 90 has four available operating modes:
Normal Mode operates the unit at maximum per-
f o rmance, and should provide a battery life of 15
hours on alkaline batteries.
Battery Saver Mode is suitable for most applica-
tions, and extends battery life to up to 20 hours on
alkaline batteries by reducing the unit’s update rate
when navigational conditions permit (e.g., you’re
travelling a steady course without constant speed
or heading variations).
Simulator Mode allows you to operate the unit
without acquiring satellites, and is ideal for practic-
ing or entering waypoints and routes while at
home.
A u t o L o c a t e T M M o d e f o rces the receiver to ‘find
itself’, or search for a new set of satellites in situa-
tions where you have moved more than 300 miles
from the unit’s last known position.
To select an operating mode:
1. Move the field highlight to the ‘mode’ field and press E .
2. Use the arrow keypad to choose a mode and press E .
The initial position field allows you to define a starting
point for simulated trips or name an initial position to
speed up the acquisition process if the unit has moved
m o re than several hundred miles with the power off .
When the GPS 90 is in simulator mode, you may select a
known waypoint as your starting position, or define a
distance and bearing from a known waypoint to calcu-
late your starting latitude and longitude.
When the unit is in not in simulator mode, the bear-
ing and distance fields will not be available. Keep in
mind that while entering an initial position may speed
up acquisition, entering an incorrect initial position will
have an adverse effect on the receiver’s ability to find the
necessary satellites to calculate an accurate position.
43
Setup Menu
Selecting an
Operating
Mode
Selecting an operating
mode.
Entering an initial
position reference.
gps 90 manual 8/6/98 10:00 AM Page 43