I've had a Garmin 168 sounder mounted about 4" forward of the binnacle mounted Richie Globemaster on my 38 since 2004. When I swung the compass in 2010, I took about 10 degrees of deviation out of the compass, but I doubt that the plotter/sounder had anything to do with it since the deviation was present whether the plotter was turned on or not.
I tested the Garmin 541s that I received as a Christmas present in the same location before I mounted it. The Garmin installation instructions specify a "safe compass distance" of 36" for the 541s. I cound discern no effect on the compass when the GPS was turned on. When I did the wiring I was careful th twist the power and ground wires to minimize induced magnetic field, just to be on the safe side. I pretty much did nothing about the NEMA wires, since they carry negligible current and I expect no significant magnetic effects. Based on my experience, I really don't see why the manufacturers have a caution about "safe compass distance" in the instructions. From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Chris Ford Sent: Thursday, January 24, 2013 6:00 PM To: cnc-list@cnc-list.com Subject: Stus-List Mounting chartplotter near magnetic compass I've been following this forum for over a year - all good stuff! Now I need some advice. I want to mount a small chartplotter (5" or 6" screen) at the binnacle, which would place it very close to my magnetic compass. Seems all the models on the market today - Raymarine, Garmin, Standard Horizon, etc - require a separation between the two, anywhere from 12" up to 3 ft. Makes it rather difficult to accomplish on a 30ft boat. I couldn't be the first sailor to face this dilemma, so any ideas or suggestions would be most welcome. Thanks! Chris Ford C n C @ C 1987 C&C30 MkII Casselman, Ontario
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