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There is no practical way of shielding against EMI on your boat. To be honest, I have only seen one device actually effect a compass, and that was a tach.

Marine electronics are built fairly well, and usually dont effect a compass at all. Have you noticed a change with the GPS installed vs removed?? If not, don't sweat it

Small boat compass are terribly inaccurate to start with.
 

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Discussion Starter · #4 ·
Yeah when I turn on gps it will turn a little over 90 degrees. The garmin unit instructions is telling me to mount it 39 3/8 in away from the compass. My console is not that big...LOL:eek:
 

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Make sure the power leads are nowhere near the compass. DC run through wires will make a magnetic field. The further apart the pos and neg leads are the bigger the influence. Ideally, the black and red are twisted to cancel out any magnetic effect.
 
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