Seiwa SW AP01 - Manual (Page 25)

Then use the arrow keys to adjust the deviation up or down until the heading
agrees with that of the ship's compass or other reference compass.
Turn to the next point and repeat the procedure until all eight have
been checked or adjusted. Press STANDBY.
Manual calibration may be fine-tuned at any time by selecting this function and
turning, for example, to just one cardinal point which may need
adjustment. Note that all calibration settings are cleared when a
COLD START is carried out.
HEADING SOURCE This allows a selection (using the ARROW keys) between a
heading input from a fluxgate compass (or slave) and a digital
heading input via one of the NMEA ports. There are two digital
heading options: a magnetic heading (HDG) or a true heading
(HDT). If the true input is used, all navigation headings are shown
as true.
A magnetic variation value must be entered if GPS sentences
containing TRUE headings are used. The variation is displayed on
a 360 degree scale, i.e. 13 degrees east appears as 013, while 10
degrees west appears as 350. Use the ARROW keys to adjust the
variation.
TACK ANGLE In auto-tack mode, the angle through which the vessel turns
may be set in 5 degree steps from 20 to 160 degrees.
RUDDER CONTROL GROUP
HELM ADJUST For best overall performance, it is important that the displayed
rudder angle be adjusted to read zero when the helm is dead
ahead. This adjustment compensates for errors in the transducer
linkage and other offsets in the steering gear. The current helm
angle is displayed and should read 00 at the centre. Use the
arrow keys to trim the reading.
RUDDER LIMITS This setting controls the maximum rudder angle used when the
system is in PILOT mode. It is preset to 20 degrees and may be
changed using the arrow keys. It should always be less than the
mechanical limits stored during the System Setup procedure.
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