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Old 17th Oct 2011, 09:55
  #20 (permalink)  
Shabez
 
Join Date: Jul 2008
Location: New Delhi
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scale varies as sec lat
so
112 mm = 11.2 cm
diff is 2 deg lat = 60 *2 = 120 nm on earth

scale denom = 120*185200 /11.2 = ANS
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