Gps/Waas Advisories - Garmin GNC 355 Pilot's Manual

Messages

GPS/WAAS Advisories

ADVISORY
<Unit> GPS receiver
has failed. Check
GPS coax for
electrical short.
GPS loss of integrity
(LOI). Verify GPS
position with other
navigation
equipment.
GPS navigation lost
due to insufficient
satellites. Use other
navigation source.
GPS navigation lost
and may have
erroneous position.
Use other
navigation source.
Abort Approach.
GPS approach is no
longer available.
Approach not
active. Approach
guidance not
available.
GPS approach
downgraded.
Use LNAV minima.
6-6
CONDITION
Internal communication
to the WAAS board is
inoperative.
GPS/WAAS board
reports LOI. Antenna
may be shaded from
satellites.
GPS position lost due to
lack of satellites.
GPS position lost due to
erroneous position.
GPS approach not
available. GPS unable to
provide approach level
of service (i.e., LPV,
LNAV, LNAV+V, or
L/VNAV).
GPS approach could not
transition to active (e.g.,
the unit remains in TERM
as it does not have the
required HPL/VPL for
LNAV).
Approach downgraded
from LPV or LNAV/VNAV
to an LNAV approach.
Vertical guidance no
longer available.
Pilot's Guide
CORRECTIVE ACTION
Use a different GPS receiver
or a non-GPS based source of
navigation. Contact dealer
for service.
Ensure the aircraft is clear of
hangars, buildings, trees, etc.
Use a different GPS receiver
or a non-GPS based source of
navigation. If the problem
persists, contact dealer for
service.
Wait for GPS satellite
geometry to improve. Ensure
the aircraft has a clear view
of the sky. Use a different
GPS receiver or a non-GPS
based source of navigation.
Contact dealer for service.
Use a different GPS receiver
or a non-GPS based source of
navigation. Contact dealer
for service.
Initiate a climb to the MSA or
other published safe altitude,
abort the approach, and
execute a non-GPS based
approach.
Abort the approach and then
execute a non-GPS based
approach.
Continue to fly the approach
using published LNAV
minimums.
190-02488-01 Rev. B