Garmin GNS 430 Pilot's Manual & Reference page 242

SECTION 14 – MESSAGES,
ABBREVIATIONS, & NAV TERMS
Not receiving input
data on 429 Channel 2
Not receiving input
data on 232 Channel 1
OBS key stuck
Poor GPS coverage
Power down and re-
initialize
RAIM is not available
RAIM not available
from FAF to MAP
waypoints
RAIM position warning
Scheduler message -
[user entered text]
Searching the sky
Select appropriate
frequency for
approach
14-6
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.
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.
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.
The GPS receiver cannot acquire a sufficient number of satellites to compute a position and
provide navigation.
The GNS 430 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 and the pilot may need to use an alternate means of navigation.
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, such as the GNS 430's VLOC
receiver.
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, such as the GNS 430's
VLOC receiver (for a VOR or localizer-based approach).
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.
The user-entered scheduler message time has expired, and the scheduler message is
displayed.
The GNS 430 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.
The aircraft is inbound and within 3 nm of the FAF; and the active VLOC frequency does not
match the published frequency for the approach. Tune the standby VLOC frequency to the
proper frequency and press the VLOC Flip-flop Key to 'activate' the frequency.
GNS 430(A) Pilot's Guide and Reference 190-00140-00 Rev. P