Simrad AP28 Operator's Manual page 24

U-Turn
U-Turn changes the current set course to be 180 degrees
in the opposite direction.
This feature is very useful in a man overboard situation
and whenever you want to steer back on a reciprocal
heading.
TURN
Press either the
make the U-Turn and start the turn.
C-turn
The autopilot provides a continuous turn feature when in
AUTO mode. This may be used for circling fish or a
particular object on the seabed.
C-turn makes the boat turn in a circle with a constant
rate of turn. The user decides whether the C-turn should
be made to port or to starboard.
To enter C-turn mode:
24 | Operation
or key to select the direction to
Boat makes starboard U-turn