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On a Direct Mercator projection a particular chart length is measured at 30°N. What earth distance will the same chart length be if measured at 60°N?
  • A
    Twice the distance.
  • B
    A larger distance.
  • C
    The same distance.
  • D
    A smaller distance.

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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