Garmin GPS 90 - Manual (Page 43)

2D NAV — at least 3 satellites with good geometry
have been locked onto and a 2 dimensional position
fix (lat. & lon.) is being calculated. ‘2D DIFF’ will
appear when DGPS corrections are being received.
3D NAV— at least four satellites with good geometry
have been locked onto and your position is being cal-
culated in latitude, longitude and altitude. ‘3D DIFF’
will appear when DGPS corrections are being received.
N E E D A LT— the receiver needs altitude to start
and/or continue 2D navigation. Enter your altitude on
the Position page (see page 36).
S E A R C H SKY— the GPS 90 is collecting new
almanac data or AutoLocate
TM mode has been select-
ed. This process can take 7.5-15 minutes.
POOR CVRG— the unit is no longer tracking enough
satellites to pro v i d e a 2D/3D position.
N O T USABLE— the receiver is unusable, possibly
due to incorrect initialization or abnormal satellite
conditions. Turn the unit off and back on.
SIMULATOR— the unit is in simulator mode.
Below the receiver status field and to the left of the
satellite sky view is the battery level indicator, which will
display the battery life level whenever the GPS 90 is
operating on internal batteries. If you’re operating off
external power, the battery indicator will not appear.
The battery level indicator is calibrated for alkaline bat-
teries. Ni-Cad and lithium batteries will not show battery
level at full scale due to voltage differences. No other
functions are affected by using Ni-Cad or lithium batteries.
On the right side of the screen, just below the hori-
zontal accuracy field is the screen backlight indicator.
To turn the screen backlighting on or off:
1. Press the B key.
2. To adjust the duration of screen backlighting, refer to the
operation setup section (page 46).
35
Status Page
Operating
Status
Searching the Sky
status indicates the
GPS 90 is collecting
new satellite data
before calculating a
GPS position.
The bulb icon indi-
cates that screen
backlighting is on.
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gps 90 manual 8/6/98 9:59 AM Page 35