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Old 25th Sep 2008, 16:35
  #1475 (permalink)  
watch_the_birdie
 
Join Date: Oct 2007
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A nautical mile is defined as the length of arc of a great circle subtended by an angle of one minute at the centre of the Earth.

i.e. 1 minute= 1 nautical mile.

1 degree = 60 minutes

and so on.
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