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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > General Navigation > For a great-circle arc on a spherical Earth, define navigational convergence as the smaller unsigned angular difference between its initial and final true tracks. If GCTTin and GCTTfin are those tracks, which expression gives this convergence?

32 - ATPL Question Bank in English - For a great-circle arc on a spherical Earth, define navigational convergence as the smaller unsigned angular difference between its initial and final true tracks. If GCTTin and GCTTfin are those tracks, which expression gives this convergence?

Question 32 - General Navigation - ATPL - Airline Transport Pilot Licence

Convergence = 1/2 x (dlong x sin lat)

The magnitude of the angular difference between GCTTin and GCTTfin, reduced to the smaller angle in the range 0 degrees to 180 degrees.

Convergence = 1/2 x (GCTTin + GCTTfin)

Convergence = (GCTTin + GCTTfin)

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