CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Magnetic compass. Person uses a magnetic compass and an ordnance survey map to navigate. A compass consists of a thin, free swinging magnetised needle that points to a dial. The dial is graduated in degrees and shows the cardinal points (north, south, east and west). The needle aligns itself with the local lines of magnetic force to indicate the direction of the north and south magnetic poles.
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