Mudcat Café Message

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User Name	Thread Name	Subject	Posted
Darowyn	BS: In Praise of the Compass (77* d)	RE: BS: In Praise of the Compass	04 Mar 11
"Never needs upgrading"!? You've never studied Navigation then! Magnetic North is not true North, and the variation and deviation changes slightly from year to year. At times (not recently though) the complete polarity of the Earth's magnetic field can reverse, so your compass would then point South(ish) Following on from the observation about the coins in the pocket spoiling the bearing reading, I used to convince Marine Engineering students of my mystical powers by making mysterious passes over a ships compass and making the needle follow my hand. It was only afterwards that I told them that I had been wearing one of those copper bangles with magnets on it- but it made the point that you can not take a compass for granted. Cheers Dave

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