hi, yes aircraft are `large metal objects` but they are made of aluminium, which doesnt affect magnetic feilds at all.ships on the other hand.....
i had a SUUNTO electonic watch compass(and barometer-altimeter-and it told the time!!)and it was a great gadget! but a cheap hiking compass(the square, see through base one)was better because you can lay it on your map and read it accurately.
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dave
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