Garmin Personal Navigator GPS 45XL Owner's Manual & Reference page 34

Reference
TracBack
Navigation
The TracBack feature will
navigate your track log back
to the oldest point in the
receiver's memory.
The track log will be divided
into segments with tempo-
r a ry waypoints to create
a route back to the begin-
ning of the track log.
30
Tips on Creating and Using the TracBack Feature
The GPS 45XL' s TracBack feature is designed to help
you quickly create and activate a route that follows your
path back to a user-defined starting point. To get the most
out of the TracBack feature, remember the following tips:
• Always clear your track log at the exact point that you
want to go back to (trail head, truck, dock, etc.).
• The 'RECORD' option on the track log setup page
must be set to the 'Yes' position.
• There must be at least two track log points stored in
memory to create a TracBack route.
• If there are not enough available waypoints in memo-
ry to create a TracBack route, you will be alerted with
a 'waypoint memory full' message, and the receiver
will use any available waypoints to create a TracBack
route with an emphasis on the track log closest to the
destination (the oldest track log point in memory).
• If the 'CRITERIA' option on the track log setup page is
set to a time interval, the TracBack route may not fol-
low your exact path (keeping the criteria set to auto-
matic will always provide the best TracBack route).
• If the receiver is turned off or you lose satellite cover-
age during your trip, the TracBack route will simply
draw a straight line between any point where cover-
age was lost and where it resumed.
• If the changes of direction and distance of your track
log are very complex, 30 waypoints may not be
enough to accurately mark your exact path. The
receiver will then assign the 30 waypoints to the most
significant points of your track, and simplify segments
with fewer changes in direction.
• If you want to save a TracBack route, copy route 0 to
an open storage route before activating another
TracBack. Activating another TracBack or storage
route will overwrite the existing TracBack route.
• Whenever a TracBack route is activated, the receiver
will automatically erase any temporary waypoints
(e.g., 'T001') that are not contained in routes 1-19. If
there are temporary waypoints stored in routes 1-19,
the receiver will create any new temporary waypoints
using the first three-digit number available.