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Protecting compass from electronics...

Old 10-06-2008, 12:30 PM
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CMP
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Default Protecting compass from electronics...

With all the electronics in the console, my compass is a mess. I don't think I can compensate within the compass itself. Has anyone ever used a copper shield as protection or am I pretty well screwed???

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Old 10-06-2008, 02:43 PM
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Default Re: Protecting compass from electronics...

I would imagine a lead shield would work better but you have to shield the electronics not the compass.
Old 10-06-2008, 02:56 PM
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Default Re: Protecting compass from electronics...

copper is only going to work if it is electrically grounded and then it will only work on electrically induced fields (eddy currents). to start, high quality electronics have shielded housings to start, so it depends on what you have in terms of expected improvement. but i this is a looooooong shot anyway as a compass is much too damped to view this type of field!

a ferromagnetic metal (e.g. mild steel) would shield the electronics' effect. however, if they are in close proximity to the compass then it will also shield a portion of earth's field and you are screwed a different way!

distance between magnetic sources (both ferromagnetic and electromagnetic) and the compass is really the best answer. get an electronic kvh w/remote fluxgate sensor and a handheld for the ditchbag as a backup. keep in mind that in addition to the obvious stuff like speakers, power cables (especially pos and neg running separately carrying a lot of amps) are also a source of magnetic fields. don't run them near the compass either.
Old 10-06-2008, 02:59 PM
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Default Re: Protecting compass from electronics...

What's a compass?
Old 10-06-2008, 03:00 PM
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Default Re: Protecting compass from electronics...

not trying to be contentious, but lead isn't going to do anything except keep superman from seeing your wiring job.
Old 10-06-2008, 04:55 PM
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Default Re: Protecting compass from electronics...

chainsaw42 - 10/6/2008 5:00 PM

not trying to be contentious, but lead isn't going to do anything except keep superman from seeing your wiring job.
Sure it will, lead will block most of any rf, and keep it from being adversly affected by it. But as the previous mentioned, you will have to "wrap" the electronics, NOT the compass.
Old 10-06-2008, 09:44 PM
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Default Re: Protecting compass from electronics...

Although the compass can be swung--and compensated, or a napier digram made for the deviation, it will have to be with the various electronics on and off. Best to get a remote reading electronic fluxgate compass (if the compass is important...)--at least run several ranges between known locations, where you can plot the bearings. At least run North / South and East/ West. Although a GPS heading will give a fairly good idea of how close the compass is, it is not accurate enough to swing the compass. I personally prefer a sun compass to do the swinging. It is an unit which can be on the boat, and you can check the deviation at any time the sun is shining.
Old 10-07-2008, 04:51 PM
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Default Re: Protecting compass from electronics...

I think your best bet is moving the compass or as thataway mentioned, use a Fluxgate to get your compass heading (but keep your mag compass for when power/electronics die). Personally, I navigate via one of several GPS's on my boat and the mag compass is just a backup, so even if mine is off a bit, it'll still get me to shore.

According to Murphy's law, and as most people have experienced, you will lose your power/electronics out on the water some day.
Old 10-08-2008, 07:07 AM
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Default Re: Protecting compass from electronics...

A magnetic compass, even a hand held is a must have on a boat, even on a big lake. If you are out after dark, you are kidding yourself if you think you don't need one.

This is coming from a certifiable gadget freak. I couldn't even live in my house without power! (I'm on a well, so if the power goes out, I can flush each toilet exactly once.)
Old 10-08-2008, 12:28 PM
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Default Re: Protecting compass from electronics...

I have nowhere to move it and like most of you, it's a backup. That said, if I lose the gps, the compass is as useless as tits on a bull. I'll compensate as best I can then make a deviation card. No worries and thanks...

CMP
Old 10-08-2008, 01:58 PM
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Default Re: Protecting compass from electronics...

I always wonder if anyone makes an upside down compass that can be mounted on the hardtop above?? That way it's out the way, can easily be viewed (just look up), away from other electronics.....

This would probably solve CMP's problemo.
Old 10-12-2008, 11:27 AM
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Default Re: Protecting compass from electronics...

If you search for commodore telltale compass you will find one. If you search for telltale compass you may find others.

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