GPS 400 Pilot’s Guide and Reference
190-00140-60 Rev. E
SECTION 12 – MESSAGES,
ABBREVIATIONS, & NAV TERMS
12-5
Message
Description
No basemap data
available
The GPS 400 has detected a failure in the built-in basemap (land data) memory. Land data
does not appear on the Map Page. Other unit functions continue to work normally; however,
the GPS 400 should be taken to a Garmin dealer for service at the earliest convenience.
Not receiving input
data on 429 Channel 1
No data has been received on the ARINC 429 channel 1 connection for a period exceeding
five seconds. If the problem persists, the installation should be checked by a Garmin dealer.
Not receiving input
data on 429 Channel 2
No data has been received on the ARINC 429 channel 2 connection for a period exceeding
five seconds. If the problem persists, the installation should be checked by a Garmin dealer.
Not receiving input
data on 232 Channel 1
No data has been received on the RS-232 channel 1 connection for a period exceeding ten
seconds. If the problem persists, the installation should be checked by a Garmin dealer.
OBS key stuck
The
OBS
Key is stuck in the enabled (or pressed) state. Try pressing the
OBS
Key again to
cycle its operation. If the message persists, contact a Garmin dealer for assistance.
Poor GPS coverage
The GPS receiver cannot acquire a sufficient number of satellites to compute a position and
provide navigation.
Power down and re-
initialize
The GPS 400 cannot calculate a position due to abnormal satellite conditions. The unit is
unusable until power has been cycled off and back on. Abnormal satellite conditions may
exist, an alternate means of navigation may be needed.
RAIM is not available
Receiver Autonomous Integrity Monitoring (RAIM) has determined that sufficient GPS
satellite coverage does not exist for the current phase of flight. (The CDI/HSI NAV flag also
appears.) Select an alternate source for navigation guidance.
RAIM not available
from FAF to MAP
waypoints
When performing an instrument approach, Receiver Autonomous Integrity Monitoring (RAIM)
has determined that sufficient GPS satellite coverage does not exist to meet the required
protection limits. Select an alternate source for navigation guidance.
RAIM position warning
Although sufficient GPS satellite coverage may exist, Receiver Autonomous Integrity
Monitoring (RAIM) has determined the information from one or more GPS satellites may
be in error. The resulting GPS position may be in error beyond the limits allowed for the
current phase of flight. Cross-check the position with an alternate navigation source. If the
warning occurs during a final approach segment (FAF to MAP), execute the published missed
approach.
Scheduler message --
[user entered text]
The user-entered scheduler message time has expired, and the scheduler message is
displayed.
Searching the sky
The GPS 400 is searching the sky for GPS satellite almanac data or the GPS receiver is in
AutoLocate Mode. Allow the unit to complete data collection (approximately five minutes)
before turning it off.
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