Garmin GPS 12MAP - Manual (Page 65)

55
REFERENCE
TracBack Tips
A TracBack route con-
tains a series of
waypoints labeled ‘T###’
that approximate your
previous route of travel.
‘Wrap’ will overwrite the
old track log data in
memory, once all
memory has been used.
‘Fill’ will record data un-
til memory is full, then
stop.
Once a TracBack has been activated, the GPS
12 MAP will take the track log currently stored
in memory and divide it into route segments,
called ‘legs’. Up to 30 track log waypoints
(labeled ‘T###’, e.g. ‘T001’) will be created to
mark the most significant features of the track
log in order to duplicate your path as closely as
possible. To gain the most benefit from the
TracBack feature, keep the following tips in
mind:
• Always clear the track log at the point
you want to return to (boat ramp, dock,
trailhead, etc.)
• The ‘Record Mode’ on the Track Logs
Page must be set to ‘Wrap’ or ‘Fill’.
• There must be at least two track log
points stored in memory to create a
TracBack route.
• If there is not enough available memory
to add more waypoints and create a
TracBack route, you will be alerted with
a ‘waypoint memory full’ message. The
receiver will use the available waypoints
to create a route with an emphasis on the
track log data closest to the destination.
Also, existing TracBack waypoints (‘T###’)
that are not contained in routes will be
erased to free more memory. The GPS 12
MAP will create new waypoints using the
first available three-digit number.
• If the Track Logs Page ‘Interval’ field is
set to ‘Time’, the route may not follow
your exact path. (Keep the ‘Interval’ field
set to ‘Resolution’ for best results.)
• If the receiver is turned off or satellite
coverage is lost during your trip,
TracBack will draw a straight line
between any point where coverage was
lost and where it resumed.
• If there are frequent changes in direction
and distance in your track log, 30
waypoints may not accurately depict your
exact path. The receiver will then assign
the 30 waypoints to the most significant
points of your track log, and simplify
segments with fewer changes in direction.