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TracBack Navigation
The third method of navigating to a destination is by
using the GPSCOM 170’s TracBack feature. The TracBack
function allows you to quickly and easily retrace your
path using the track log automatically stored in the
receiver’s memory. The advantage of the TracBack feature
is to eliminate the need to mark waypoints along the way
and manually create and activate a route back to where
you began your trip.
The TracBack route is created by reducing your cur-
rent track log into a route of up to 30 waypoints, and acti-
vating an inverted route along those points. Once activat-
ed, a TracBack route will lead you back to the oldest track
log point stored in memory, so it’s usually a good idea to
clear the existing track log at the starting point of your
current trip (e.g. the dock) before you get started.
To clear the track log and define a starting point for a
TracBack route:
1. From the map page, press
E
. Highlight the
‘TRACK SETUP?’ option and press
E
. The track log
page will appear.
2. Use the arrow keypad to highlight ’CLEAR LOG’ and
press
E
.The clear log confirmation page will
appear. Highlight ‘YES’ and press
E
.
To activate a TracBack route:
1. From the map page, press
E
and highlight the
‘TRACK LOG’ option.
2. Press
E
to access the track log page.
3. Highlight the ‘TRACBACK?’ option and press
E
.
Once the TracBack function has been activated, the
unit will take the track log currently stored in memory
and divide it into segments called legs. Up to 30 tempo-
rary waypoints (e.g., ‘T001’) will be created to mark the
most significant features of the track log in order to dupli-
cate your exact path as closely as possible. A TracBack
route from your present position to the oldest track log
point will be created as the active route (the active route
page will appear), and provide steering guidance to each
waypoint back to the starting point of your track log.
TracBack
Navigation
Reference
40
Clearing the log before you
get started will define the
position the TracBack func-
tion will return you to.
Highlight the ‘TRACBACK’
prompt and press ENTER to
begin TracBack navigation.
An on-screen status box will
monitor the progress of the
TracBack calculation.
170 manual pages rev D 9/21/98 9:23 AM Page 40
45


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