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The GPSMAP 175’s man overboard (MOB) function lets you
simultaneously mark and set a course to a position for quick response to
emergency situations.
To activate the MOB function:
1. Press the B key.
2. Press the T key to confirm and begin navigating to the MOB position.
Once a MOB has been activated, a MOB icon will appear on the map
display, and the destination field on the map page will display the bearing,
distance, and ETE to the MOB position based on your present speed and course.
To stop navigation to the MOB position:
1. Press the G key, followed by O, to display the GOTO options page.
2. Select the ‘Cancel GOTO’ option and press T.
TracBack Navigation
The third method of navigating to a destination is by using the GPSMAP
175’s TracBack feature. The TracBack function allows you to retrace your
path using the track log automatically stored in the receiver’s memory, which
will eliminate the need to store waypoints along the way. TracBack routes are
created by reducing your track log into a route of up to 30 waypoints and
activating an inverted route along those points. Once activated, a TracBack
route will lead you back to the oldest track log point stored in memory, so it’s
good idea to clear the existing track log at the start of your current trip (e.g.,
your dock) before you get started.
To clear the track log and define a starting point for a TracBack route:
1. Press the O key twice to display the main menu page.
2. Highlight the ‘Track’ option and press T.
3. Select the ‘Delete Track?’ option and press T.
4. Highlight the ‘Yes’ field and press T.
GOTO/MOB
MOB & TracBack Navigation
A. The MOB mode can
be used to set a course
to a passing spot for
quick response to an
emergency, fish
strikes, etc. If you
want to save the
MOB waypoint, be
sure to rename it, as
it will be overwritten
the next time a MOB is executed.
B. To define a starting point for a TracBack route, clear the track log.
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175 Manual 7/31/98 3:57 PM Page 51