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Navigationhard#280

The departure formula for east-west distance is:

A

Distance = d.long (min) × cos(lat)

Correct

B

Distance = d.lat × cos(long)

C

Distance = d.long × sin(lat)

D

Distance = d.lat × sin(long)

Explanation

Departure (NM) = change in longitude (minutes) × cos(latitude). This converts longitude difference to actual distance at a given latitude.

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