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Magnetic Compass Dinghy Install

Printed From: Yachts and Yachting Online
Category: General
Forum Name: Repair & maintenance
Forum Discription: Questions & tips on the subject
Printed Date: 25 Jun 18 at 5:10pm
Software Version: Web Wiz Forums 9.665y -

Topic: Magnetic Compass Dinghy Install
Posted By: Sam.Spoons
Subject: Magnetic Compass Dinghy Install
Date Posted: 25 Jan 17 at 2:24pm
I'm planning to install a Silva 103 on my Spice using a Selden Mast Mount. I know that ferrous metal fittings can cause deviation, and I know that stainless steel, while barely magnetic is still a ferrous metal alloy. However, how much effect (if any) are things like ss kicker fittings (no wire rope just dyneema) going to have, and should I use brass bolts to fix the compass to the bracket or are ss ok?

Posted By: Noah
Date Posted: 26 Jan 17 at 10:15am
I've never considered potential variation in my dinghy compass, which happens to be a tacktick. Given that we're never out of sight of land (excepting fog!) and its use is tactical, not navigational, I think any errors are irrelevant. Happy to hear conflicting views though...

Nick" rel="nofollow - GBR 14821: Sijambo

Posted By: pondlife1736
Date Posted: 26 Jan 17 at 6:20pm
Marine grade austenitic 316 stainless steel should be OK as it is barely magnetic. The problem is when it is cold worked or welded which can change the micro-structure into ferritic, ie much higher magnetic susceptability.
Easy to check with a magnet though.

Posted By: Time Lord
Date Posted: 26 Jan 17 at 10:33pm
Or even simply putting the bit in question near to the compass and see what happens to the needle as you move the bit around.

Merlin Rocket 3609

Posted By: Sam.Spoons
Date Posted: 26 Jan 17 at 11:46pm
Brilliant, WTF didn't I think of that Beer will do.

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