Garmin MX20 - Manual (Page 130)

Appendix
Problem Possible Cause Action
POS data flag shows Antenna or wiring
Position source wpt
Position source serial data
Interference
Installation setup
Check the antenna and wiring
Ensure that a waypoint is selected
as the current destination and a Nav
flag is not shown
Ensure that the serial data output is
configured properly
Have dealer/installer check for any
interference sources
Have dealer/installer check for
proper MX20 setup
RTE (Route) flag Position source route Ensure that the external position
source has an active route engaged
ALT (Altitude) flag Serial altitude source Ensure the serial altitude encoder is
powered up and working properly
Have dealer/installer check for
proper installation and setup of the
encoder
If altitude data is provided by an
Apollo GX product, ensure that the
GPS position has been acquired and
a waypoint is selected as the current
destination
LT (Lightning) flag WX500 installation Have dealer/installer check for
proper installation of the WX500
Troubleshooting