Simrad AP28 Operator's Manual page 80

Range Change per step Default Units
10 - 30 10 10 °
Dockside settings when using Virtual Rudder
Feedback
The Virtual Feedback algorithms in the autopilot software
enable your autopilot to steer without a conventional
rudder feedback unit. These algorithms are designed for
vessels up to 40 ft. powered by outboard or stern drives
only.
Installing a feedback unit, however, will enhance the
performance of an autopilot and provide an accurate
rudder angle indicator on the autopilot display. Unless
impractical or impossible, a rudder feedback unit should
be installed.
The autopilot is configured for Virtual Feedback when there
is no feedback unit connected at first time turn on, and at
turn on after an Autopilot reset has been performed (Page
110).
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80 | Setup at installation