28 ST600R Autopilot Control UnitDrive StoppedThis alarm is activated if the autopilot is unable to turn the rudder.This occurs if the weather load on helm is too high, or if therequested rudder position is past the preset rudder limits or therudder end-stops.Data Not ReceivedThis alarm is displayed in the following circumstances:• Track mode is engaged and the autopilot is not receiving SeaTalknavigation data.• Track mode is engaged and the position transducer (GPS, Loran,Decca) is receiving a low strength signal – this will clear as soon asthe signal strength improves.• Vane mode is engaged and the autopilot has not received wind angledata for 30 seconds.The autopilot stops adjusting the locked heading as soon as data islost.Waypoint AdvanceThe waypoint advance alarm sounds whenever the target waypointnumber changes, which occurs in the following circumstances:• Automatic acquisition is selected by pressing TRACK from Automode• Waypoint advance is requested by pressing TRACK for 1 second inTrack mode (SeaTalk Navigators only).When the alarm sounds, the pilot continues on its current heading,but displays the bearing to the next waypoint and the direction inwhich the boat will turn to take up that bearing.Check that it is safe to turn onto the new track, and press TRACK toaccept the waypoint advance.To cancel the alarm without accepting the waypoint advance, pressSTANDBY to return to hand steering, or AUTO to return to Auto.Note: The waypoint advance will only operate on pilots receiving validbearing to waypoint and waypoint number information.
