Distance between two parallels of latitude (along a meridian)
1 minute of latitude at any point on earth = 1 nm
1°of latitude at any point on earth = 60 nm
Distance between two meridians of longitude (along a parallel)
Meridians converge from the Equator to the Pole.
A change in longitude (degrees) will not represent the same East-West distance (nm) for different latitudes.
Departure = change in longitude (°) x 60 x cosine (latitude)
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