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post #13 of Old 08-06-2013 Thread Starter
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Re: Helm control panel question

Interference of the magnetic compass... could that be one of the reasons for scattering electrical based devices around the cockpit? Mechanical engine gauges do not operate off electrical signals so I may simply use old school tech on them. I'll have to see if Farryman built any mechanical tach drives into their mid 70s engines.

I just read an article in "Good Old Boat" (July Aug 2013, pg 55) where compass interference from an on board generator caused as much as a 40 degree error... they ended up sailing into a rock wall of a coast in Turkey (I think it was Turkey)... but then a generator, especially if it contained permanent magnets likely should have never been installed just below the compass (that wasn't well defined in the article, but wasn't very far away evidently from the wording). If it was electromagnetic field "magnets"... the magnetic fields would collapse once de-energized and then not effect the compass (I believe, could be a residual... I'll ask my Uncle). But with permanent magnets the mag field would always be present. Either of these are very strong magnetic fields compared to modern electronic instruments so I'll be investigating over time on this and post when I know more.

All knowlegde and experiences for all of you is more than welcome.

I'll be in the Great Lakes initially where its not likely quite as critical, but after retirement who knows where I'll sail it.


1980 Seafarer Swiftsure 30
1978 Bayliner Buccaneer 270 (now sold and being restored in FL)
1962 SeaMac 14' Plywood Runabout, mahogany decked, with 1959 Evinrude 35 Big Twin (owned since age 17, I'm now 60)
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