86 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook6 Setting-up the ST4000+8. Use -1 and +1 or -10 and +10 to adjust the displayed heading untilit matches boat’s steering compass or a known transit bearing.9. Press and hold standby for 2 seconds to exit calibration and savethe new settings.Note: Setup options are always saved on exit.Adjusting the heading alignmentYou should always check the compass alignment after completing thedeviation correction procedure (swinging the compass). After youhave completed the initial deviation correction procedure, you canmake adjustments to the alignment as often as you wish withoutswinging the compass again.Although the compass deviation correction procedure removes mostof the alignment error, small errors (of the order of a few degrees) willprobably remain, that vary depending on the heading.Ideally, you should check the heading reading against a number ofknown headings, plot a deviation curve, and determine the headingalignment value that will give the lowest average alignment error.You can then enter this value on the Heading Alignment screen, asdescribed above.If the average heading error is more than 5°, you should perform thecompass deviation correction procedure again, circling slower and inmove favorable conditions.D3459-2Autopilot heading Steering compassKnownheadingD3327-281131_8.book Page 86 Thursday, October 7, 2004 11:03 AM
