Simrad AP28 Operator's Manual page 21

Response adjust
The Autotune function in the AP28 is so refined that the
majority of boats will need no further adjustments of the
steering parameters. On some boats, however, or at
particular sea conditions a fine tuning of the steering
parameters may improve the performance of the
autopilot.
The Response control allows you to make this fine tuning
for each of the two (HI/LO) parameter sets. The response
can be set to nine levels. Level 4 is default with
parameter values as set by the Autotune function. If no
Autotune is made (not recommended) the level 4 values
are the factory default values.
A low response level reduces the rudder activity and
provides a more "loose" steering.
A high response level increases the rudder activity and
provides a more "tight" steering.
A too high response level will make the boat start S-ing.
When you access the RESPONSE page the highlighted
Adjust parameter is the one that is active.
Adjustment of HI and LO values can be performed even
with the boat out of the water.
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