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Two positions at the same latitude are marked on an aeronautical chart and the meridians at those positions converge with an angle of 30°. The effect of this convergence is that the true track of…
  • A
    rhumb line track between both positions will be either 090º (T) or 270º (T).
  • B
    the rhumb line and great circle route between those two positions will differ by 30° at either position.
  • C
    the great circle route between those two positions will change by 30°.
  • D
    the rhumb line route between those two positions will change by 30°.

Refer to figure.
Rhumb Line is a line represented at the surface of the earth which cuts all the Meridians at the same angle. Is it is a line of constant direction.

  • For two positions lying on the same latitude, the rhumb line track follows that parallel of latitude, and is therefore either 090°(T) or 270°(T).

Note: As it does not state which chart it is and only states Earth convergence and not chart convergence, the only way we would know if 30º Convergency was right was if we knew exactly what chart were dealing with.

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