8 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook2 Basic OperationAutomatic tack (AutoTack)The ST4000+ has a built in automatic tack facility (AutoTack) thatturns the boat through a pre-determined angle in the requireddirection. The default AutoTack angle is 100°, but you can adjust thisin Dealer setup (see page 97).• to AutoTack to port: press the -1 and -10 keys together• to AutoTack to starboard: press the +1 and +10 keys togetherMaking major course changesCAUTION:Only make major course changes when steering MANUALLY.This ensures that the boat will safely clear any obstructions orother boats, and you can take into account the changed wind andsea conditions on the new heading before engaging the autopilot.Large course changes which change the apparent wind direction canproduce large trim changes. When a sudden trim change occurs (forexample due to weather helm or sail imbalance) there will be a delayof up to one minute before the automatic trim applies rudder to restorethe locked heading.In these situations, the autopilot will not immediately assume the newautomatic heading, and will only settle onto course when theautomatic trim has been fully established. To eliminate this problem,use the following procedure to make major course changes:WindAutoTack - StarboardD5399-1WindAutoTack - PortAutoTackangle AutoTackangle81131_7.book Page 8 Wednesday, March 17, 2004 3:59 PM
