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Old 04 April 2009, 19:02   #11
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You've both got a good point. And considering the type of cruising I'll mainly be doing. What do ya think then lads? Move the radio, compare compass readings with a handheld and adjust as much as possible? And I'll try and stay away from the bugger
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Old 05 April 2009, 04:29   #12
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JSP - I wouldn't compare to a handheld - how will you know the H/Held is any more accurate (especially if you are holding it). If you want to test the accuracy of the compass I would travel slowly along a clear transit on a calm day and compare reading to the chart. Ideally do the same in a different area (so eliminating local geological effects) and at roughly 90 degrees to the first time.

I thought one of the issues with radios and compasses was that they could swing when the speaker was in use (recieving) so even a professional will not be able to compensate for that sort of intermittent effect.
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Old 05 April 2009, 05:30   #13
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This is from the Precautions section of all the Icom radio manuals:

KEEP the transceiver at least 1 m away from the ship’s navigation compass

The speaker in the radio has a magnet, similarly, there is a magnetic field from the handset, these fields are there regardless of whether the set is on, off, receiving or transmitting.

All bad news for navigation.
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Old 05 April 2009, 07:36   #14
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Cheers Polwart and Geoffs.

I was thinking of someone else using the handheld so I could determine how much I effected it but as you've pointed out Polwart, not the best way. Will use your sugestion

Geoffs, thanks for the info. The radio isn't a meter away at the moment. Can't you buy shielded compasses? Or have I dreamt that?
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Old 05 April 2009, 07:49   #15
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Cheers Polwart and Geoffs.

I was thinking of someone else using the handheld so I could determine how much I effected it but as you've pointed out Polwart, not the best way. Will use your sugestion

Geoffs, thanks for the info. The radio isn't a meter away at the moment. Can't you buy shielded compasses? Or have I dreamt that?
Why not ditch the fixed compass and have a handheld. Lets face it its only there for when your GPS screws up anyway

I have a handheld Garmin Vista GPS as well that lives in a waterprof box in the joackey. So if my plotter fails I have the handheld and if that fails then the compass is next although I have to admit I don't always head out with paper charts on board
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Old 05 April 2009, 07:52   #16
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Originally Posted by geoffs View Post
This is from the Precautions section of all the Icom radio manuals:

KEEP the transceiver at least 1 m away from the ship’s navigation compass

The speaker in the radio has a magnet, similarly, there is a magnetic field from the handset, these fields are there regardless of whether the set is on, off, receiving or transmitting.

All bad news for navigation.
Hey Geoffs, any news on these antenna prices. I'm trying to give my business to site members.
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Old 05 April 2009, 07:54   #17
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Has anyone actually tried using charts when its windy!
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Old 05 April 2009, 07:55   #18
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Cheers Polwart and Geoffs.

I was thinking of someone else using the handheld so I could determine how much I effected it but as you've pointed out Polwart, not the best way. Will use your sugestion

Geoffs, thanks for the info. The radio isn't a meter away at the moment. Can't you buy shielded compasses? Or have I dreamt that?
Why not ditch the fixed compass and have a handheld. Lets face it its only there for when your GPS screws up anyway

I have a handheld Garmin Vista GPS as well that lives in a waterprof box in the joackey. So if my plotter fails I have the handheld and if that fails then the compass is next although I have to admit I don't always head out with paper charts on board
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Old 05 April 2009, 14:30   #19
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Has anyone actually tried using charts when its windy!
It's always windy on a RIB! At what speed were you reading yours at

Seriously however. Scrap the fixed Compass like Chris said and use the space for the radio or something else. Buy a good quality handheld one, you can use it for taking bearings as well as a back-up. Some even have mounts that you could fix to the console and mount it there when you need it.
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Old 05 April 2009, 15:31   #20
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Is there a bit of confusion about 'hand held GPS' and 'hand bearing' compasses?!

It's pretty good practise to have paper charts on board (preferably encapsulated!) and a hand bearing compass, just incase you electronic gismos pack up. ( and maybe some parallel rules/Breton Plotter/pencil bla bla .You can always slow down/stop and make it less windy!
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