Seiwa SW AP01 - Manual (Page 35)

If no position is found giving less than 30 deg deviation, the services of a compass
adjuster should be sought.
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The autopilot will not operate satisfactorily with compass deviations above 30 deg. A
compass calibration (See Sec 2.5) is recommended after the installation is complete.
3.4 RUDDER TRANSDUCER
Mount the rudder transducer next to the rudder post. The transducer should normally
have its arm uppermost, but may be inverted if this is more convenient. The linkage
schematic is shown in Fig 3.7. When fitting it is important that the effective lengths of
the transducer arm and the quadrant or tiller arm (marked D2) be equal to each other
and that the link rod be the same length as the spacing between the transducer and
rudder post (D1). This is to ensure that the transducer angle tracks the angle of the
rudder. Mount the transducer so that its arm is over the cable entry point when the
rudder is centred.
Figure 3.7 Rudder Transducer Linkage
Lay the cable back to the Junction Box and terminate it in the Rudder Transducer plug
as shown in Fig 3.8.
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