Garmin GNC 420 Pilot's Manual & Reference page 160

MESSAGES,
10
ABBREVIATIONS
& NAV TERMS
Approaching VNAV profile
the initial Vertical Navigation descent, or climb, point.
Arrival at waypoint [waypoint name]
alarm circle for the indicated waypoint. The size of the arrival alarm cir-
cle is defined from the "CDI / alarms" menu option on the setup 1 page.
Auto CDI scale selected
adjustment to accommodate the various flight phases: en route, terminal
and approach. When a "Manual" CDI scale is selected from the setup 1
page, the GNC 420 will revert back to "Auto" within 30 nautical miles of
a destination airport. The GNC 420 will also revert back to the "Auto"
setting upon next power up—the "Manual" setting is NOT saved when
the GNC 420 is turned off.
Cannot navigate locked FPL
flight plan (FPL) with one or more locked waypoints. A waypoint can be
"locked" when the NavData® card is replaced and the waypoint(s) does
not exist in the new database.
Can't change an active waypoint
modify the position of the active "to" or "from" waypoint. The GNC 420
will not allow modifications to user waypoints currently being utilized for
navigation guidance.
152
—You are within one minute of reaching
—You are within the arrival
—The CDI scale has been set to "Auto" scale
—You have attempted to navigate a
—An attempt has been made to
Can't delete an active or FPL waypoint
to delete the active "to" or "from" waypoint. The GNC 420 will not allow
you to delete user waypoints currently being utilized for navigation guid-
ance.
Check unit cooling
—The GNC 420 has detected excessive display
backlighting temperature. The backlighting has been automatically
dimmed to reduce the temperature. Check for adequate ventilation or
check cooling air flow. Contact your Garmin dealer for assistance.
COM has failed
—The GNC 420 has detected a failure in its commu-
nications transceiver. The COM transceiver is not available and the unit
should be returned to your Garmin dealer for service.
COM is not responding
—Internal system-to-system communica-
tion between the main processor and the COM transceiver has failed.
Operational status of the COM transceiver is unknown and the unit
should be returned to your Garmin dealer for service.
COM needs service
—The GNC 420 has detected a failure in its com-
munications transceiver. The COM transceiver may still be usable, but
the unit should be returned (at your earliest convenience) to your Garmin
dealer for service.
COM push-to-talk key stuck
—The external push-to-talk (PTT) switch
is stuck in the enabled (or "pressed") state. Try pressing the PTT switch
again to cycle its operation. If the message persists, contact your Garmin
dealer for assistance.
COM remote transfer key is stuck
switch is stuck in the enabled (or "pressed") state. Try pressing the switch
again to cycle its operation. If the message persists, contact your Garmin
dealer for assistance.
—An attempt has been made
—The remote COM transfer