Seiwa SW AP03 - Manual (Page 20)

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2.4 THE MODE KEY
The MODE key provides for adjustment to the steering settings, access to the navigation
data and access to the programming menus.
Press the MODE key once. The display shows the current control
mode setting.
CONTROL
AUTO TUNE
USE < OR >
Press one of the arrow keys to select the desired control mode from
the following (for further information, see Sec 2.7):
AUTO TUNE
Auto-tune is the standard setting for the autopilot. When selected, no
further adjustment should be needed during use. However, there may
be situations where you wish to operate with fixed tuning and the
following manual choices may be selected.
NORMAL
Direct proportional control with a counter-rudder component that be
adjusted from the menu (see below). More information on manual
settings is given in Sec 2.7.
ROUGH
This suits most vessels in heavy conditions. The control has a
deadband which permits a 5 deg yaw about the reference course
before correction is applied. Outside this window, the control is as for
the Normal mode. Rudder activity and power consumption are
therefore kept to a minimum.
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Sea State
MODE