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ComNav Admiral P3 Installation & Operation How Autopilots Work
Document PN 29010075 V3.1 - 17 -
Autopilot is steering vessel
on a heading of 225° (SW)
Autopilot responds to the
change in desired heading
Operator selects new
desired heading of 135° (SE)
by moving the rudder to
Port -- vessel begins to turn
As the actual heading
approaches the new desired
heading, the Autopilot starts
to move the rudder back
towards mid-ships position
then straighten out
the new heading slightly,
Autopilot to "over-shoot"
Typical response is for the
heading of 135° (SE)
the vessel on the new
Autopilot is now steering
N
Figure 2 – Heading Change in AUTO Mode
Wind and Current Effects
If your boat encounters a crosswind, and/or a tidal current, at some angle to the Desired
Heading, it will be constantly pushed away from that heading, in the direction of the wind or
current. So the autopilot will constantly be making course corrections.
As that condition persists, the SPU will gradually begin to maintain the rudder a few degrees
to Port or Starboard of the centred position, to counter the effect of wind, and/or current. This
feature, known as trim, will keep your boat pointed in the right direction, despite the wind or
current.
However, one side-effect of trim is that your boat may not follow the Track you want – it will
maintain your Desired Heading, but the track will “slip” sideways in the direction of the
crosswind and/or current. This potential problem can be solved by using another mode that
ComNav Autopilots provide: NAV mode, described next.
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