Garmin G1000 System Maintenance Manual page 209

Failure Message
LOI – GPS integrity lost.
Crosscheck with other NAVS.
GPS NAV LOST – Loss of GPS
navigation. Insufficient satellites.
GPS NAV LOST – Loss of GPS
navigation. Position error.
GPS NAV LOST – Loss of GPS
navigation. GPS fail.
G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
190-00716-01
Cause
If the primary receiver is a WAAS
sensor, the alert indicates that
GPS position data has timed out.
There is no GPS position fix
available or the system is in dead
reckoning mode.
The G1000 has detected an
internal position warning has
occurred.
The G1000 has detected a GPS
engine failure.
Solution
•
Verify the area the aircraft was
traveling through did not have loss
of GPS coverage. FAA NOTAMs
may be issued for periods of
outages, or the US Coast Guard
website
http://www.navcen.uscg.gov/gps/gps
notices/default.htm will have notices
posted.
•
Using the MFD AUX – GPS Status
page, verify the signal strength bars
are not erratic. If so, this indicates
outside interference is affecting the
GPS receivers. Find and remove
the source of interference (i.e. cell
phones, FBO datalink antennas,
etc.).
•
If GPS receivers can not aquire a
position lock, troubleshoot per the
"Will not acquire satellites" section.
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