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Once a TracBack has been activated, the GPS III Pilot will take the track log cur-
rently 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 (your home, your
home airport, etc.)
• The ‘Record Mode’ on the Track Log Setup 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 closest to the destination. Also, existing track log waypoints that are
not contained in any route will be erased to free more memory. The GPS III Pilot
will create the new waypoints using the first available three-digit number.
• If the Track Log Setup Page’s ‘interval’ field is set to ‘Time’, the route may not fol-
low 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 way-
points 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.
A TracBack route contains 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.
65
REFERENCE
TracBack Tips
GPS III Pilot B2 4/1/99 2:02 PM Page 65