Correcting The Compass Deviation - Raymarine ST4000+ Owner's Handbook Manual

81131_8.book Page 83 Thursday, October 7, 2004 11:03 AM
Chapter 6: Setting-up the ST4000+

Correcting the compass deviation

Depending on your boat type, deviating magnetic fields can cause
compass errors up to 15°. The correction procedure reduces these
errors to a few degrees, so you MUST perform this procedure as the
first item in your initial sea trial.The ST4000+ will then automatically
correct the fluxgate compass for most deviating magnetic fields.
CAUTION:
If you fail to complete the deviation correction, your autopilot's
performance will be impaired on some compass headings.
The deviation correction procedure (swinging the compass) involves
turning your boat in slow circles so the ST4000+ can determine the
deviation and calculate any correction required. You must carry out
this procedure in calm conditions and preferably on flat water.
Performing the automatic deviation correction
1. Make sure the autopilot is in Standby but with the drive
disengaged.
2. Press and hold the standby key for 2 seconds to display the User
setup entry page (SET UP).
SECONDS
Note: If you see CAL LOCK, you need to turn off the calibration lock in
Dealer Setup (see page 98).
3. Press the DISP key so you see the SWING COMPASS page.
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