Garmin GPS 400 Pilot's Manual And Reference page 214

SECTION 12 – MESSAGES,
ABBREVIATIONS, & NAV TERMS
Message
GPS needs service
GPS stored data was
lost
Inside airspace
Invalid closest pt of
FPL
Invalid FPL
modification
Invalid waypoint ident
MAIN processor
requires service
Memory battery low
Near airspace -- less
than 2 nm
Need altitude - display
position page
No altitude input is
being received
12-4
The GPS 400 has detected a failure in its GPS receiver. The GPS receiver may still be usable,
but the unit should be returned (at the earliest convenience) to a Garmin dealer for service.
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).
The GPS-calculated position lies within the boundaries of a special use airspace. This
message is automatically disabled within 30 nm of an arrival airport, when an approach is
loaded.
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.
An attempt was made to modify the final course segment (FAF to MAP) of an instrument
approach. The GPS 400 does not allow the modifications.
An attempt was made to create a user waypoint with an invalid name. The GPS 400 does
not allow spaces between characters in the waypoint name.
The GPS 400 has detected a failure in the main system processor. The GPS 400 is not usable
and should be taken to a Garmin dealer for service.
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.
The GPS-calculated position is within 2 nm of a special use airspace boundary, but the
aircraft is not projected to enter the airspace. This message is automatically disabled within
30 nm of an arrival airport, when an approach is loaded.
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 data is being received from RS-232 (Serializer: Icarus, Rosetta or Shadin) or grey
code inputs. If the problem persists, contact a 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.
GPS 400 Pilot's Guide and Reference
Description
190-00140-60 Rev. E