More expensive compasses tend to use a mineral oil for greater dampening. The risk of getting a strong alternating magnetic field close to anything that is magnetized is that you could degauss it. But the field has to be strong and close so I suspect that 2M should be fine.
We had a cover and base chromed before a Bermuda trip on a C&C 44 and had to degauss that because it was having a significant effect on the compass. BTW if you need to use a degausser (strong AC electromagnet) you have to slowly approach and move away from the object or you may end up with a stronger magnetic field than you started with. Don Newman C&C 44 On Wed, Nov 20, 2013 at 3:40 PM, dwight veinot <dwight...@gmail.com> wrote: > My binnacle compass stays onboard all winter long...it is a Danforth > compass...it has had a small bubble for many years but I live with that, > besides I hardly ever pay much attention to it...I use the digital heading > readings on my wheel pilot and my chartplotter whcih are mounted on the > binnacle guard more regularly. > > I thought, however, that such compasses were filled with mineral spirits > but from what has been posted lately some it appears an alcohol mix is used > > Dwight Veinot > Alianna > C&C 35 MKII > Head of St. Margaret's Bay, NS > > > On Wed, Nov 20, 2013 at 4:18 PM, Alex Giannelia <a...@airsensing.com> wrote: > >> Having read the responses to the thread I started, I forgot to mention >> that I had my boat active from 2001 to 2006 and the compass worked >> wonderfully despite a small bubble which remained the same size throughout. >> That has now disappeared. >> >> What Rich says makes sense and knowing the winter temperatures in >> Halifax, if his or Dwight's survived multiple freeze thaw cycles, then it >> has no negative effect. >> >> I tend to favour Rich on the don't touch a perfectly well functioning >> accessory. >> >> I just found the whole design and manufacturing thing interesting to say >> the least and will proceed with my re-construction. >> >> I will then keep the list posted with respect to any detectible effects >> running a 10KW electric motor has about 2m away from said compass... >> >> Cheers! >> >> Alex >> >> Alex Giannelia >> a...@airsensing.com >> (416) 203-9858 >> www.airsensing.com >> >> >> >
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