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16 GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > NAVIGATING TO A DESTINATION
To activate a TracBack using the NAV key:
1. Press NAV, highlight the Follow Track, and press ENTER.
2. Highlight the track you want to follow, and press ENTER.
3. Choose Original to navigate from the start to the end of
your trip, or choose Reverse to navigate from the end to the
start of your trip, and press ENTER.
4. To stop TracBack navigation, press NAV, highlight Stop
Navigation, and press ENTER.
When a TracBack is active, the GPSMAP 188/188C Sounder
takes the track log currently stored in memory and divides it into
segments called legs. Up to 50 (188) or 254 (188C) temporary
turns (BEGIN, TURN 1, TURN 2, TURN 3,...., TURN X, END)
are created to mark the most significant features of the track log in
order to duplicate your exact path as closely as possible. To get the
most out of the TracBack feature, remember the following tips:
• Always clear the track log at the starting point.
• Set the Record Mode option on the track log setup page to
Fill or Wrap.
• The track log memory must contain at least two points to
create a TracBack route.
• If the track log interval is set to the Time option, the route
can not follow your exact path. For best performance, keep
the interval set to resolution.
• If the receiver is turned off or satellite coverage is lost during
your trip, the TracBack draws a straight line between any
point where coverage was lost and where it resumed.
• If the track log’s changes in distance and direction are too
complex, 254 waypoints can not mark your path accurately.
The receiver then assigns the 254 waypoints to the most
significant points of your track, and simplifies segments with
fewer changes in direction.
For more information on setting up the Track options and saved
tracks, see page 59.