flux gate compass
reads between 5 and 40 degrees different than magnetic compass
derived course. Boat
is a Beneteau
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
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?