Garmin GPS III A Owner's Manual

Also see for GPS III: Declaration of conformity Quick guide Owner's manual Owner's manual

Once a TracBack has been activated, the GPS III will take one of the track logs cur-rently stored in memory and divide it into route segments, called ‘legs’. Up to 30 tracklog waypoints (labeled ‘T###’, e.g. ‘T001’) will be created to mark the most significantfeatures of the track log in order to duplicate your path as closely as possible. To gainthe 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 aTracBack route.• If there is not enough available memory to add more waypoints and create aTracBack route, you will be alerted with a ‘waypoint memory full’ message. Thereceiver will use the available waypoints to create a route with an emphasis onthe track log data closest to the destination. Also, existing track log waypointsthat are not contained in routes will be erased to free more memory. The GPS IIIwill 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 followyour 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, TracBackwill draw a straight line between any point where coverage was lost and whereit 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 assignthe 30 waypoints to the most significant points of your track log, and simplifysegments with fewer changes in direction.A TracBack route contains aseries of waypoints labeled‘T###’ that approximate yourprevious route of travel.‘Wrap’ will overwrite the oldtrack log data in memory,once all memory has beenused. ‘Fill’ will record datauntil memory is full, thenstop. 53REFERENCETracBack Tips