Simrad AP28 Operator's Manual page 99

If the auto-setting does not perform properly due to high
inertia from the wheel or a loose steering gear, it can be
adjusted manually.
Find the lowest possible value that will prevent the
rudder from continuous hunting. A wide deadband will
cause inaccurate steering. It is recommended to check
rudder stability in AUTO mode when the boat is moving
to get pressure on the rudder.
Range
AUTO, 0.1 – 4.0
The rudder deadband setting is not available when the
autopilot is configured for Virtual feedback.
SimNet configuration
SimNet units can be assigned in groups and given an
instance number for identification.
Change per step
0.1
Default Units
AUTO
Setup at installation | 99
°