B&G Vulcan Series, Руководство оператора

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Spiral turn
Spiral-turn makes the vessel turn in a spiral with a decreasing or
increasing radius. You set the initial radius before the turn is
initiated, and the change per turn during the turn. If the change per
turn is set to zero, the vessel turns in a circle. Negative values
indicate decreasing radius while positive values indicate increasing
radius.
Zigzag turns
Steers the vessel in a zigzag pattern.
For navigating in a zigzag pattern, you set the initial heading
change before the turn is started.
During the turn you can alter the main heading, the heading
change, and the leg distance.
Square turn
Makes the vessel automatically turn 90° after having travelled a
defined leg distance.
At any time during the turn you can change the main heading and
the distance of the leg until the vessel makes a new 90° turn.
Lazy S-turn
Makes the vessel yaw around the main heading.
You set the selected heading change before the turn is started.
During the turn you can alter the main heading, the heading
change and the turn radius from within the turn dialog.
Depth contour tracking, DCT
TM
If the system has Echosounder input, the autopilot can be set to
follow a depth contour.
Warning: Do not use this feature unless the seabed is
suitable. Do not use it in rocky waters where the depth
is varying significantly over a small area.
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Autopilot | Vulcan Series Operator Manual