Our
Raymarine flux gate
compass reads between 5 and 40 degrees different than magnetic
compass and
GPS derived course.
Boat is a
Beneteau 49,
fluxgate compass location is below the starboard aft
cabin hanging locker. The
MPPT controllers (2) for our
solar array are located about 2-1/2 feet from the FGC (installed about 2 years ago) and their wires are lead within 6 inches of the compass. The deviation does not seem to vary with the amount of
power produced by the
solar array.
The control
head was replaced 1 1/2 years ago with an ST70. The course computer is about 8 years old. We cannot access the sea trial menu to try to recalibrate, although we can access the dockside calibration wizard. A
Raymarine technical rep said that an ST70 control
head cannot access this menu in a 6000 series course computer. He also recommended using a hand held compass to see if the solar controllers have upset the FGC.
Can anyone offer a suggestion how how to re-calibrate our FGC?