Sitex SP38 Autopilot, Installation And Operation Manual

Page: 112 / 162

Sitex SP38 Installation and Operation Advanced Operation
Document PN 29010101 V2r0
- 1 11 -
Figure 57 – Typical WORK Mode Screen (Engaged)
To disable WORK mode, press the WORK button again, for approximately 1 second, until a
confirming beep is heard and the letter `W´ disappears from the display. WORK mode can
also be cancelled by switching to either STANDBY or POWER STEER mode.
When WORK mode is engaged, the Rudder Scale Factor changes the amount of corrective
rudder movement which the steering algorithms calculate using the Rudder Gain setting. In
WORK mode, that calculated amount (i.e., proportional to the course error) will also be
multiplied by the Scale Factor, resulting in larger rudder movements for a given course error.
The Rudder Scale Factor is entered on the Work menu.
Other effects take place in WORK mode too.

The corrective rudder movement calculated for Counter Rudder is reduced to the
minimum possible for the vessel type (i.e., as if the Counter Rudder parameter was set
to 0), which enhances the effect of the Rudder Gain and Rudder Scale Factor.

Turn Rate is limited to 10° per second while WORK is active, for all changes of Heading
controlled by the autopilot, and for Special Turns.

Particularly useful for pair trawling, the autopilot also disables the automatic course trim
unless Autotrim (in the Work menu) is specifically turned on.

Finally, the built-in off-course alarm will be disabled the entire time WORK mode is
engaged.
If the user is not satisfied with the fixed helm bias determined by the Autopilot at the onset of
WORK
mode, manual adjustments can be made “on-the-fly” while WORK mode is engaged.
A double-press of the WORK button will bring up the regular Work menu, but with an
additional line.