ComNav 2001 Autopilot System
P/N 29010017 V1.0 - 45-
SPECIAL TURNS
When the autopilot is in the PILOT mode, pressing the U-TURN key together with either the red or green ARROW key for
one second initiates the PRE-SELECTED type of special turn.
EMERGENCY TURN
The Emergency Turn is selected by placing the
autopilot in the STANDBY mode, pressing the
U-TURN key, followed by either the red or green
ARROW key until the display shows 'E.trn'.
This turn is sometimes called the 'man overboard
turn' or 'Williamson turn'. If the vessel's speed is
not changed while the turn is in progress, it
should bring the vessel about in such a way that it
retraces its own path in the water.
An Emergency Turn to port is initiated by placing
the autopilot in the PILOT mode and pressing
the U-TURN key together with the red ARROW
key for one second. The autopilot will make a 90
degree turn to port. When that turn is complete,
the autopilot will automatically make a 270
degree turn to starboard. The function indicator
will change to an 'E' until both turns are complete.
When the second turn is complete, the vessel
should be retracing its own track in the water.
Pressing the U-TURN key and the green
ARROW key for one second starts the same
thing, only the first 90 degree turn is to starboard,
and the second 270 degree turn is to port.
The speed at which the turns are performed is set
by the TURN RATE control, and should not be
changed during the turn (otherwise the vessel will
not end up on its own track).
CONTINUOUS TURN
The Continuous Turn is selected by placing the
autopilot in the STANDBY mode, pressing the
U-TURN key, followed by either the red or green
ARROW key until the display shows 'C.trn. This
is a turn which continues endlessly until
something is done to stop it.
A Continuous Turn to port is initiated by
placing the autopilot in the PILOT mode and
pressing the U-TURN key together with the red
ARROW key for one second. The vessel will
turn at the rate determined by the TURN RATE
control. The vessel will continue to turn until
either the red or green ARROW keys is pressed.
The function indicator will show a 'C' until the
turn is stopped. The vessel will then travel in the
direction indicated on the display. Pressing the U-
TURN key and the green ARROW key will start
a similar turn to starboard.
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