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Old 11 January 2007, 20:36   #11
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Originally Posted by Hightower View Post
Well you only really need to know where North, East, South and West are. You'll hit land eventually .
Sort of what I was trying to get at. And you probably don't need a compass for that.
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Old 12 January 2007, 02:20   #12
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Sort of what I was trying to get at. And you probably don't need a compass for that.
In heavy fog, or at night away from lights, a compass would be about the only non-electronic method of finding direction.

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Old 12 January 2007, 02:44   #13
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Thanks for the responses:
Yes as i said and has been suggested i will take off the speakers one at a time starting with the one under the compass.
I'll let you know what happens.

As to navigating I do and always will use my compass as the first aid to nav' every time.
Over here in the Scillies i could head in any direction and hit land but there wouldn't be much boat left..!!
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Old 12 January 2007, 07:04   #14
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Originally Posted by Hightower View Post
Check for wiring as well, the bulb in my compass had the two wires twisted together. This caused a deviation in the compass, untwisting them sorted it.
That's interesting. The idea of twisting the wires is to cancel out the magnetic field created around them when the current flows. It's standard practice. Could you see the compass move when you switched the light on and off and if so, did it stop moving when you untwisted the wires?

Tony
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Old 12 January 2007, 07:45   #15
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Originally Posted by alystra View Post
That's interesting. The idea of twisting the wires is to cancel out the magnetic field created around them when the current flows. It's standard practice. Could you see the compass move when you switched the light on and off and if so, did it stop moving when you untwisted the wires?

Tony
Yes, that's exactly what happened. I had to buy the bulb and holder seperatly (it's a plastimo one). I did read all the info when setting it all up, but can't remember if the instructions told me to twist or not (was 3 years ago).
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Old 12 January 2007, 07:57   #16
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I'm having the same problem at the moment, I fitted a plotter and planned to relocate the compass further back, in the centre on the console, but in the position I would like it to go it swings about 20 degrees out)

You can buy compasses that offer the facility to adjust or compensate for other offending objects or equipment. I'm not sure how compact/whether they make on that will suit your purpose/size/hole! but plastimo make some:

go to this link and click: Horizon 135 compass on the menu on the left:

http://www.plastimo.com/catalogue/in...tid=1&LangID=1
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Old 12 January 2007, 08:02   #17
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BTW alternatively and a cheaper option, buy some small magnets, work out where they need to go and how many you need to correct the problem and araldite them to the side of the compass until you compensate for the problem! - I've done this before and it works.
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Old 12 January 2007, 08:06   #18
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The other option to consider is using a fluxgate compass with a display.

You can then place the sensor in the best suitable position away from stray fields, (up to 5m away from display). Still won't be perfect but may help. All the usual suspects make them - NASA, Raymarine, Navman etc.

Bit more expensive that a regular compass and some people just don't like not having a 'real' compass. Does need power as well of course, but if that's failed, which way you're pointing is the least of your worries.
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Old 12 January 2007, 08:37   #19
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been here before to a certain extent
Compass fitting.
the mic for our icom had no speaker thingie in it at all but instead a carbon pellet which sensed the voice vibrations and had no effect on the compass. Compasses do work, bloody hell we went for miles on a compass and a watch before we had decca and later gps. Takes some forward planning and some experience in steering to it, but there was life at sea before gps, honest! All our advanced clients steer a long course home at night by compass with the gps switched off and I'm still here, so the compasses must work!
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Old 12 January 2007, 19:21   #20
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I always take out a handheld compas on a neckstrap, it works for me!

Whenever I switch on a GPS the first thing I see is a disclaimer from the manufacturer telling me that they don't take any responsibility for the accuracy of the information the GPS gives you.......call me old fashioned but that bothers me.

I am with Mikecc on this one and believe the only true solution to the compasss issue is to use a fluxgate
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