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Old 01-08-2015, 09:13   #1
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Raymarine flux gate compass problem

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?

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Old 01-08-2015, 11:35   #2
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Re: Raymarine flux gate compass problem

Is the magnetic compass accurate?
What about course drift from the water's current?
Several variables here.

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Old 01-08-2015, 11:46   #3
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Re: Raymarine flux gate compass problem

sounds like you need to find the proper control head first step.
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Old 05-08-2015, 10:52   #4
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Re: Raymarine flux gate compass problem

Magnetic compasses have been swung, its not current, same error at all states of tide & currents.

To calibrate, will have to find an old control head- not the greatest solution. Their newest compasses are 9 axis, solid state, no calibration required, can be mounted anywhere but only work with the latest course computers.
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Old 05-08-2015, 11:04   #5
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Re: Raymarine flux gate compass problem

Did you try putting a known good hand bearing compass next to the FGC? This is the first basic troubleshooting step. Drive the boat in a slow circle and note whether the two match within a few degrees. Make a list of headings according to the FGC and the real compass. If you see a wide range in the difference do that a couple more times. If it is a calibration issue the differences will be consistent. If the error is random then it may indicate some electronic failure or interference. VHF and SSB radios are a good source of interference. Solar controllers are also notoriously noisy.

The autopilot control head should be able to access the compass calibration function. That's the one where you make slow circles with the boat.
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