Garmin GPSMAP 420 Owner's Manual page 63

No XM Signal*—the GXM 31 antenna is not receiving an XM
signal.
Off Course Alarm—you are off course the distance set in the "Off
Course" alarm.
Route Already Exists—you entered a route name that already exists
in memory. Modify the route name or delete the previous route
name.
Route Full—you attempted to add more than 250 points to a route.
Reduce the number of points or create a second route.
Route Truncated—uploaded route from another device has more
than 250 waypoints and was truncated to fit.
Route Waypoint Memory Full—no additional route waypoints can
be saved.
Severe Storm Warning*—a severe storm warning has been issued
for the area by the National Weather Service.
Shallow Water Alarm—the Shallow Water Alarm depth has been
reached.
Sonar Service Incompatible—the external sonar device you are
connected to needs a software update.
GPSMAP 400 Series Owner's Manual
®
Sonar Timeout—there is an internal problem with the unit. Contact
your dealer or Garmin Product Support to have the unit serviced.
Sonar Service Lost—the external sonar device you were connected
to has either been disconnected or the unit has lost communication
with the sonar device for some other reason.
Tornado Warning*—a tornado warning was issued for the area by
the National Weather Service.
Track Already Exists [Track Name]—you entered a saved track
name that already exists in memory. Modify the track name or delete
the existing track.
Track Log Full—the track log is full and track recording has been
turned off. To record more track points, you need to clear the track
log and turn track recording on. This only appears when the track
recording setting is set to "Stop When Full."
Track Memory is Full, Can't Create Track—the track log
memory is full. No additional track log data can be stored without
deleting old data to create memory space.
Track Truncated—a complete uploaded track does not fit into
memory. The oldest track log points were deleted to make space for
the most recent data.
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