Garmin GPS 45 Owner's Manual & Reference page 24

Reference
Satellite
Status Page
16
2D Navigation status indicates that at least
three satellites with good geometry have been
locked onto and a 2 dimensional position fix
(latitude and longitude) is being calculated. '2D
Diff' will appear when you are receiving DGPS
corrections in 2D mode.
3D Navigation indicates that at least four satel-
lites with good geometry have been locked onto
and your position is now being calculated in lat-
itude, longitude and altitude. '3D Diff' will appear
when you are receiving DGPS corrections in 3D
mode.
Searching the Sky indicates that the GPS 45 is
collecting new almanac data or AutoLocate
mode has been selected (see page 38). This
process can take 7.5 to 15 minutes.
Poor GPS Coverage indicates that the receiver
is no longer tracking enough satellites to pro v i d e
a 2D or 3D position fix.
Simulating Navigation indicates that the
receiver is in simulator mode.
Below the receiver status field and to the left of
the satellite sky view is the battery level indicator.
The battery level indicator is calibrated for alka-
line batteries. Ni-Cad and lithium batteries will not
show the battery level at full scale due to voltage
differences. No other receiver functions are
affected by using Ni-Cad or lithium batteries.
On the right side of the screen, just below the
horizontal accuracy field is the screen backlight
indicator. When backlighting is on, a bulb icon
will appear. To turn the screen backlighting on
or off:
B
1. Press the key.
2. To adjust the duration of screen backlighting,
refer to the operation setup section (page 39).
TM