Garmin 55 AVD Owner's Manual page 61

MEM FULL - The waypoint memory is full. You should delete unused
waypoints to make room for new waypoints.
NEED ALT - The GPS 55 needs altitude input in order to start or continue
2D navigation. Press NAV to enter altitude on the Position Page.
NO EMP RT - There are no empty routes available into which another route
may be copied.
POOR CVRG - The GPS 55 cannot acquire sufficient satellites necessary
to provide navigation.
PROX ____ - Your craft has penetrated the alarm circle of the proximity
waypoint. Press WPT to view your position relative to the waypoint.
PROX WPT - An attempt has been made to delete a waypoint which is a
member of the proximity list. You must remove the waypoint from the
proximity list before the waypoint can be deleted.
PRX OVRLP - The circles defined by two proximity waypoints overlap. When
entering the area of the overlap, the GPS 55 will alarm you of the closest
proximity waypoint, but not both. You should be certain this condition is
desirable.
RCVR FAIL - The GPS 55 has detected a failure in the receiver hardware.
If the message persists, the GPS 55 is unusable and should be taken to an
authorized GARMIN service center.
RE-INIT - The GPS 55 is unable to compute a position. Initialize the position
on the Position Page to within 1000 nautical miles of your actual position.
ROM FAILD - The GPS 55 has detected a failure in its memory. The unit is
unusable and should be taken to an authorized GARMIN service center.
ROUTE WPT - An attempt has been made to delete a waypoint which is a
member of one or more routes. You must remove the waypoint from all
routes before the waypoint can be deleted.
RTE FULL - An attempt has been made to add more than nine waypoints to
a route. The GPS 55 will not allow more than nine waypoints per route.
SHORT LEG - The upcoming leg is too short for smooth waypoint transitions.
Expect a rapid change in the CDI.
SRCH SKY - The GPS 55 is in search-the-sky mode. Allow the unit to
complete its data collection before turning it off.
STEEP TRN - This message appears one minute prior to a turn that requires
a bank angle in excess of 25 degrees in order to stay on course.
TIMER EXP - The count down timer has expired.
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