Problem
Possible Cause
Action
MSG light stays on
after power-on.
Displayed
message is: IN
USE SENSOR
CANNOT
COMPUTE Lat/Lon
The In-Use
position sensor is
not able to
calculate a position
Check for
obstructions and
connections to the
antenna.
The GPS engine
may need to be
reset.
No, or too few,
airports show up
on the Map display
Runway Limits are
set for a value that
is too large
Reset the Runway
Limits value,
see
Bearing &
distance values
appear to be
wrong
A mistake may
have been made
in entering the
Lat/Lon position
for a User
waypoint, or the
wrong waypoint
was selected
Verify that the
position of the
User waypoint is
accurate
Check the FROM
and TO waypoints
Wrong bearing
and track values
Incorrect magnetic
variation entered
Check Magnetic
Var option - select
“Automatic” or
enter correct
value,
see page
104
Troubleshooting
146