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Old 31 October 2017, 09:26   #1
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Magnetic Compass

The magnetic compass on the dash of my Rib was very accurate since purchase, however just recently it is 40-50 degrees out. Nothing has been fitted or altered to the boat during this time. Thinking that the compass may have developed a fault I bought a new one and on fitting, it is still out by the same amount. Thankfully money not wasted as I need a compass for another Rib that I am doing up. Does anyone have any explanation or know if they can be adjusted. It is a Plastimo offshore 75 flush mount compass.
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Old 31 October 2017, 09:44   #2
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Originally Posted by briansuddon View Post
The magnetic compass on the dash of my Rib was very accurate since purchase, however just recently it is 40-50 degrees out. Nothing has been fitted or altered to the boat during this time. Thinking that the compass may have developed a fault I bought a new one and on fitting, it is still out by the same amount. Thankfully money not wasted as I need a compass for another Rib that I am doing up. Does anyone have any explanation or know if they can be adjusted. It is a Plastimo offshore 75 flush mount compass.
40-50 degrees isn't going to "adjust" out.

VHF extension speaker, handrail, different fuel tank, only on the trailer or in the water? Magnetic mounting screws?

Tried the boat at different locations in case it's a local anomaly?

Does the compass work ok when it's nowhere near the boat?
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Old 31 October 2017, 13:46   #3
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Magnetic Compass

Quote:
Originally Posted by Last Tango View Post
40-50 degrees isn't going to "adjust" out.

VHF extension speaker, handrail, different fuel tank, only on the trailer or in the water? Magnetic mounting screws?

Tried the boat at different locations in case it's a local anomaly?

Does the compass work ok when it's nowhere near the boat?


+1 adjustment is good for around 5-6deg on a small cheap compass, which at the end of the day is a moot point on a bouncing RIB. Anyone who can maintain a straight course on a RIB, purely on compass alone is a better man than me.
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Old 12 November 2017, 14:39   #4
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Have you changed your belt buckle or phone or similar?
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Old 12 November 2017, 15:10   #5
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Have you changed your belt buckle or phone or similar?
Handheld VHF in your pocket ?

Anything with a loudspeaker will have a powerful magnet in it and can still effect a compass at a metre plus away.
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Old 12 December 2017, 03:51   #6
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Originally Posted by Last Tango View Post
Handheld VHF in your pocket ?

Anything with a loudspeaker will have a powerful magnet in it and can still effect a compass at a metre plus away.
I once went to install a sub woofer in my console, had the rib on a trailer and the sub woofer in my hand as I stepped onto a step ladder to climb into the rib, even on the first step of the ladder I could see the magnetic compass moving which was about 1.5m away from me, they are very sensitive, anything nearby could be effecting it.

If you haven't changed anything recently check the wiring inside the console, perhaps some wiring loom has moved or fallen down somewhere due to boat slamming etc which may be effecting the magnetic field.
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