B&G Zeus2 Glass Helm CPU - Manual (Page 55)

Lazy S-turn
In the lazy-s turn the boat will 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 input from an echosounder, 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.
Use the following process to initiate DCT steering;
1. Ensure that you have depth reading on the panel or on a separate depth instrument
2. Steer the boat to the depth you want to track, and in the direction of the depth contour
3. Activate AUTO mode, select depth contour steering and monitor the depth reading
4. Select the port or starboard option in the turn dialog to initiate the depth contour steering
to follow the bottom sloping to starboard or to port
The following parameters are available for depth contour tracking:
Depth gain
This parameter determines the ratio between commanded rudder and the deviation from
the selected depth contour. The higher depth gain value the more rudder is applied.
If the value is too small it will take a long time to compensate for drifting off the set depth
contour, and the autopilot will fail to keep the boat on the selected depth.
If the value is set too high the overshoot will increase and the steering will be unstable.
Contour Cross Angle (CCA)
The CCA is an angle that is added to or subtracted from the set course.
With this parameter you can make the boat yaw around the reference depth with lazy-s
movements.
The larger the CCA the bigger yawing will be allowed. If you the CCA set to zero there is no S-
ing.
Using the Zeus 2 Processor in an AP24/AP28 system
Command transfer
If your Zeus 2 Processor is connected to an autopilot system including an AP24 or AP28
control unit, only one control unit can be active at the same time. An inactive control unit is
indicated with a square with a cross symbol in autopilot controller pop-up.
You take command from an inactive control unit by selecting the mode in the autopilot pop-
up, and then confirming active mode.
Autopilot | Zeus 2 Glass Helm 55