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Old 27-09-2008, 16:27   #16
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The compass is located about 4 feet from the engine.

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Old 27-09-2008, 17:12   #17
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I went with a rate gyro compass (Maretron SSC200) on my steel boat, and hesitated somewhat when placing it in the fiberglass instrument pod over the companionway... since that gap in the steel deck introduces a scary 35-degree variation when moving up and down with a hockey-puck compass. Reassured by Maretron, I went ahead and mounted it, then ran through the calibration by doing multiple controlled circles at a constant rate of turn (see below for the track... there was a little current running in the channel). Astonishingly, it's now correct to the degree, perfectly tracking the binnacle compass that has been professionally swung.

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Old 27-09-2008, 18:48   #18
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I had one mounted beneath the floor of the hanging locker in the aft cabin. It worked fine until my wife put her Thigh Master in the locker.
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Old 21-08-2010, 08:47   #19
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I know this is an old thread, but I though I would add this if anyone was still curious/listening.
The topic came up in a GSP thread and I went searching for some answers but haven't found the exact one I was looking for. This thread indicates some misunderstanding of flux-gate - so what I know so far.

2-axis flux-gates, which most are, are sensitive to two things
1. level
2. magnetic materials.

change the level of the sensors by more than a couple degrees and the direction changes significantly. 3-axis flux-gates do not have this issue.

MOVE the sensors into different magnetic environments and the direction indication change also makes it unusable.

THEREFORE, it does not make a difference WHERE u place the flux-gate in the boat as long as u calibrate it before use AND do not move it or any magnetic material in or into its space - say 3' - during use.
Again a 3-axis flux-gate has been -reported- to not suffer from this error and the reason for that is what I am searching for now.

Since magnetic fields on Earth vary in different locals, the flux-gate needs to be periodically calibrated as u move its location relative to the Earth as from port to port. - but then if the above is true re the 3-axis, then it should not require re-calibration in this instance - which is hard to believe.

I will just keep searching.

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compass, fluxgate, raymarine

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