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16th Feb 2011, 06:45

#437 (permalink)

Aviator4u

Join Date: Nov 2010

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if scale= 1:1000,000,then 1 inch on chart=1000,000 inches on map.

Since 1 inch equals 2.54 cm, so 1000,000 inches=2540000 cms =25400m=25.4km=25.4/1.852Nms=13.71 Nms

or

since 12 inches=1 feet
1000,000 inches = 1000,000/12=83333.33ft

1 nm = 6080 ft therefore 83333.33/6080=13.7Nms

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