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date: 03 December 2020

azimuth compass, 

Source:
The Oxford Companion to Ships and the Sea
Author(s):
 Dear Dear, Peter KempPeter Kemp

a compass designed to observe the value of the local magnetic variation. Early navigators had no knowledge of the phenomenon, and it was not until the 15th century that it became clear that the compass needle did not point true north. It is sometimes claimed that it was ... ...

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