Navigating a Saved TrackYou can save your track log to use later as a TracBack, whichreduces your track log into a route with up to 300 turns. Wheninitiated, a TracBack route leads you back to the oldest stored tracklog point. It is a good idea to clear the existing track log before youstart your current trip. Also, you must save an active track log beforeyou can navigate it as a TracBack.To activate a TracBack using the NAV key:1. Press NAV, highlight Navigate Track, and press ENTER.2. Highlight the track you want to navigate, and press ENTER.Selecting a Saved Track3. Use the ROCKER to select the point you want to navigate to(TracBack to), and press ENTER.TracBack TipsWhen a TracBack is initiated, the GPSMAP 378/478 divides thetrack into segments called legs. Up to 300 temporary turns arecreated to mark the most significant features of the track in order toduplicate your exact path as closely as possible. To get the most outof the TracBack feature, remember these tips:• Always clear the track log at the point that you want to goback to (such as a dock or campsite).• The Record Mode option on the Active Track tab must be setto Fill or Wrap.• If the track log Interval option on the Active tab is set to theTime option, the route might not navigate your exact path(keep the interval set to Resolution for best performance).• If the receiver is turned off or satellite coverage is lost duringyour trip, TracBack draws a straight line between any pointwhere coverage was lost and where it resumed.• If the changes in distance and direction of your track are toocomplex, 300 waypoints might not mark your path accurately.The receiver then uses the most significant points of yourtrack so there will be fewer changes in direction.GPSMAP 378/478 Owner’s Manual 39BASIC OPERATION IN MARINE MODE > M ANAGING YOUR TRACKS
