45Chapter 5: Customising the SystemOff Course AlarmThis is the off course alarm angle. It controls the alarm that warns youif the autopilot is unable to maintain its set course.The alarm operates if the autopilot strays off course by more than thealarm angle limit for more than 20 seconds.The value must be within the range 15 to 40°, and can be adjusted in1° steps.Range: 15 to 40°Default: 20°AutoTrimThe AutoTrim level setting determines the rate at which the autopilotapplies “standing helm” to correct for trim changes caused byvarying wind loads on the sails or superstructure. The settings are:Setting Effect Recommended for:1 Slow trim correction Heavy displacement vessels,with full keel or transom rudder.2 Medium trim correction Heavy displacement vessels.3 Fast trim correction Moderate to light displacementvessels.4 Super fast correction Planing power vesselsDefault: 3The default setting (Level 3) should provide optimum performancewith the ST600R autopilot. However, depending on the vessel’sdynamic stability, an incorrect rate of trim application may result inpoor course keeping due to autopilot instability.
