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The receiver status field, located at the top left of the page, can display the fol-
lowing messages under various conditions:
Search sky - The GNC 300 is searching the sky for visible satellites. You
will be informed with the message ‘Searching the Sky’.
Acquiring - The GNC 300 is acquiring satellites for navigation.
2D Nav - The GNC 300 is in 2D navigation mode. If your installation
does not include an altitude serializer, you must enter the
altitude manually (see page 2).
3D Nav - The GNC 300 is in 3D navigation mode and will compute
altitude.
Simulator - The GNC 300 is in simulator mode, which should only be
used for practice and trip planning. Never use simulator
mode for actual navigation.
Poor cvrg - The GNC 300 can’t acquire sufficient satellites for navigation.
Need alt - The GNC 300 needs altitude in order to start/continue navi-
gation. Select the position page and enter the altitude.
Need pres - The GNC 300 needs the current altimeter (barometric pres-
sure) setting at the approach airport. Enter the altimeter set-
ting on the position page.
Not usable - The GNC 300 is unusable due to incorrect initialization or
abnormal satellite conditions. Turn the unit off and on again.
If this does not help, return the unit to an authorized
GARMIN dealer for service.
17
REFERENCE
Density Altitude/
True Air Speed
Acquiring satellites for navigation.
Searching the Sky.
SECTION
1
NAV KEY
Receiver Status Field
300 7/14/98 8:49 AM Page 17