Raymarine ST70 Instrument, Installation Manual

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Chapter 3: Commissioning Procedures 53
If necessary, use the Setting counter rudder procedure in the ST70+ User Reference
Manual , to improve autopilot performance.
Rudder damping
If the autopilot is ‘hunting’, i.e. continuously moving the steering backwards and
forwards by small amounts, use the
Setting rudder damping procedure in the ST70+
User Reference Manual , to improve autopilot performance.
Setting AutoTrim
AutoTrim determines how quickly the autopilot applies ‘standing helm’ to correct for
trim changes, caused, for example, by changes in the wind load on the
superstructure, or an imbalance of engines.
Increasing the AutoTrim level reduces the time the autopilot takes to return to the
correct course, but makes the boat less stable. If the autopilot:
•
Gives unstable course keeping and the boat ‘snakes’ around the desired course,
decrease the AutoTrim level.
• Hangs off course for excessive periods of time, increase the AutoTrim level.
If necessary, use the Setting AutoTrim procedure in the ST70+ User Reference
Manual , to improve autopilot performance.
3.6 After commissioning
When the dockside setup and open water calibration have been completed, and you
have returned to normal operation, your ST70+ system is ready for use. Refer to the
ST70+ Operating Guide for instructions on how to use ST70+ on a day-to-day basis.
EMC conformance
Always check the installation before going to sea to make sure that it is not affected by
radio transmissions, engine starting etc.
To do this:
1. Turn on all transmitting equipment (radar, VHF radio etc.).
2. Check that all electronic systems are unaffected by the transmitting equipment
(e.g. without undue interference).
87099_1.book Page 53 Thursday, March 12, 2009 10:18 AM