Chapter 3: Advanced Operation 233 Advanced Operation3.2 Using Wind Vane mode – sail boatsNote: You can only select Wind Vane mode if the autopilot isreceiving suitable SeaTalk or NMEA wind direction information.About Wind Vane modeWhen the autopilot is in Wind Vane mode it uses the fluxgatecompass as the primary heading reference. As changes in the true orapparent wind angle occur, the autopilot adjusts the locked compassheading to maintain the original wind angle.Wind informationTo use Wind Vane mode, the autopilot must receive wind informationfrom one of the following sources:• SeaTalk wind instrument connected to the autopilot via SeaTalk• NMEA wind instrument• Raymarine pushpit wind vane connected via a SeaTalk interfaceTrue and apparent windType 150/150G and 400/400G autopilots can maintain a courserelative to either an apparent or true wind angle in Wind Vane mode:• steering to apparent wind, the autopilot maintains the apparentwind angle• steering to true wind, the autopilot maintains the true wind angleNote: The default setting is apparent wind. On Type 150/150G and400/400G autopilots you can change this to true wind in User orDealer Calibration (see page 85). Type 100/300 autopilots can onlymaintain a course relative to apparent wind.WindTrimIn Wind Vane mode the autopilot uses WindTrim to eliminate theeffects of turbulence and short term wind variations. This providessmooth and precise performance with minimal power consumption.You can adjust the wind response (WindTrim) level in User or DealerCalibration (see page 85) to control how quickly the autopilotresponds to changes in the wind direction. Higher wind trim settingswill result in a pilot that is more responsive to wind changes.
