Garmin GPS 500 Pilot's Manual & Reference page 156

10- Messages,
Abbreviations &
Nav Terms
GPS needs service—The GPS 500 has detected a failure in its GPS
receiver. The GPS receiver may still be usable, but the unit should be
returned (at your earliest convenience) to your Garmin dealer for service.
GPS stored data was lost—Satellite almanac, ephemeris and time
data have been lost due to a memory battery failure, system reset or data
expiration (data over six months old).
Heading input failure—The heading selection on the external HSI's
(or CDI's) OBS course selector cannot be read properly. Your Garmin
dealer may need to check the installation.
Inside airspace—Your GPS-calculated position lies within the
boundaries of a special use airspace. This message is automatically
disabled within 30 nautical miles of an arrival airport, when an approach
is loaded.
Invalid closest pt of FPL—A closest point cannot be created from the
waypoint entered on the "Closest point of flight plan" window. This
occurs when the selected waypoint is beyond the limits of all legs in the
flight plan, too far away, or when a unique waypoint name for the closest
point cannot be created.
148
Invalid FPL modification—An attempt was made to modify the final
course segment (FAF to MAP) of an instrument approach. The GPS 500
does not allow the modifications.
Invalid waypoint ident—An attempt was made to create a user
waypoint with an invalid name. The GPS 500 does not allow spaces
between characters in the waypoint name.
MAIN processor requires service—The GPS 500 has detected a
failure in the main system processor. The GPS 500 is not usable and
should be taken to your Garmin dealer for service.
Memory battery low—The internal battery that sustains user memory
is low and should be replaced by a Garmin dealer as soon as possible.
Failure to do so may result in loss of stored data, including flight plans,
user waypoints, unit settings and satellite data.
Near airspace—less than 2 nm—Your GPS-calculated position is
within 2 nautical miles of a special use airspace boundary, but you are not
projected to enter the airspace. This message is automatically disabled
within 30 nautical miles of an arrival airport, when an
approach is loaded.
Need altitude - display position page—The GPS receiver needs
altitude input in order to start and/or continue 2D navigation. Select the
Position page and verify the altitude reading. If the altitude is in error by
more than 500 feet, enter the current altitude as accurately as
possible. An inaccurate altitude directly translates into inaccurate position
information.
No altitude input is being received—No altitude data is being
received from RS-232 (Serializer: Icarus, Rosetta or Shadin) or grey code
inputs. If the problem persists, contact your Garmin dealer and check the