Section 10: Messages, Abbreviations & Navigation Terminology - Garmin GPS 500 Pilot's Manual & Reference

Messages
The GPS 500 uses a flashing "MSG" annunciator at the bottom of the
screen (directly above the MSG key) to alert you of any important infor-
mation or warnings. While most messages are advisory in nature, warning
messages may require your intervention. Whenever the "MSG" annuncia-
tor flashes, press the MSG key to display the message. Press MSG again
to return to the previous page.
The following is a list of available messages and their meanings:
Airspace ahead—less than 10 minutes—Your GPS-calculated
course is projected to enter a special use airspace within 10 minutes. This
message is automatically disabled within 30 nautical miles of an arrival
airport, when an approach is loaded.
Airspace near and ahead—Your GPS-calculated position is within 2
nautical miles of the boundary of a special use airspace and your course is
projected to enter the airspace within 10 minutes. This message is
automatically disabled within 30 nautical miles of an arrival airport,
when an approach is loaded.
Altitude input failure—The GPS 500 is configured to receive altitude
serializer data (Icarus, Rosetta or Shadin) and it is not being received. Or,
the data was being received, but has been interrupted. If a grey code
altitude input is available, it will be used instead. If the problem persists,
contact your Garmin dealer and check the installation and installation
settings. When this message occurs, no pilot action is required if enough
satellites are available for a 3D position fix (provided no RAIM warnings
are present). However, if only a 2D position fix is possible, the pilot
should maintain the GPS altitude within 1,000 feet of pressure altitude—
by entering the altitude on the Position page.
Approach is not active—The approach could not transition to
"active", at 2 nautical miles or closer to the FAF. Verify that "SUSP" DOES
NOT appear directly above the OBS key, indicating the auto waypoint
sequencing is suspended. This message also appears if Receiver Autono-
mous Integrity Monitoring (RAIM) has determined that sufficient GPS
satellite coverage DOES NOT exist for the phase of flight you are currently
in (along with a "RAIM not available from FAF to MAP" message).
Approaching target altitude—The current GPS-computed altitude is
within 500 feet of the final Vertical Navigation target altitude.
Approaching VNAV profile—You are within one minute of reaching
the initial Vertical Navigation descent, or climb, point.
Arrival at waypoint [waypoint name]—You are within the arrival
alarm circle for the indicated waypoint. The size of the arrival alarm circle
is defined from the "CDI / alarms" menu option on the Setup page.
Cannot navigate locked FPL—You have attempted to navigate a flight
plan (FPL) with one or more locked waypoints. A waypoint can be
"locked" when the NavData® card is replaced and the waypoint(s) does
not exist in the new database.
10- Messages,
Abbreviations &
Nav Terms
145