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A straight line is drawn on an aeronautical chart and the true track between two positions at different latitudes on that line changes by 28°. What does this mean?
  • A
    The Earth meridians at the two positions converge with an angle of 28°.
  • B
    The Earth meridians at the two positions converge with an angle of 14°.
  • C
    The chart meridians at the two positions converge with an angle of 28°.
  • D
    The chart meridians at the two positions converge with an angle of 14°.

Chart Convergency (or Convergence) is defined as the angle of inclination between two selected meridians, measured at a given latitude (or the change in direction of a great circle).

  • If the true track between two positions at different latitudes on that line changes by 28º => the convergency equals 28º.

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