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Subject: Compasses
From: Martin Gardner (mwgardner@XXX.XXX)
Date: Wed May 29 2002 - 09:44:59 EDT
I was on a boat over the weekend with both a binnacle compass and a
fluxgate.
After removing the canister airhorn from the drink holder and watching the
binnacle compass swing 20 degrees, there was still a 10 degree discrepancy
between the binnacle and the fluxgate.
Fluxgates may be off the charter of the list: if so, please reply privately.
My question: any ideas? The binnacle had a deviation card showing no
errors, and it agreed pretty well with a handheld. The fluxgate was mounted
below, maybe three feet from the refrigeration compressor, not near any
other obvious stuff.
Are fluxgates subject to the same deviation error sources as real magnets?
Martin
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