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If a straight line is drawn on an aeronautical chart between any two positions, what will determine the true track change along that line between the two positions?
  • A
    The chart convergence between the two meridians.
  • B
    The Earth convergence between the two meridians and the sine of the mean latitude.
  • C
    The Earth convergence between the two meridians.
  • D
    The chart convergence between the two meridians and the sine of the parallel of origin.

Convergency is the angle of inclination between two meridians at given latitude.

Convergency = Change in Longitude × Sine Latitude

The difference between great circle direction and rhumb line direction joining two points is called conversion angle and it is equal to half of the convergency for the same two points.

Conversion angle = ½ Convergency

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