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Hallar nuestra situación estando situados en la enfilación de los Faros de Cabo Roche y Cabo Trafalgar, siendo la demora verdadera al Faro de Punta de Gracia (Oc25s13M ) de 026º.Find your position when located on the leading line of Cabo Roche and Cape Trafalgar lighthouses while observing Punta de Gracia lighthouse at a true bearing of 026º:

Show the answer

Correct answer: a) l = 36º 00' N ; L = 005º 51.8' W

Why it is correct

Extending SE the leading line through Cabo Roche and Cape Trafalgar lighthouses (143º) and intersecting it with the reciprocal bearing 206º from Punta de Gracia lighthouse (36º 05.4′ N, 005º 48.6′ W) fixes the position at l = 36º 00′ N, L = 005º 51.8′ W.

Why the others are not

  • b) Does not match the intersection of the Roche–Trafalgar alignment with bearing Dv(Gracia) = 026º.
  • c) Does not match the intersection of the Roche–Trafalgar alignment with bearing Dv(Gracia) = 026º.
  • d) Does not match the intersection of the Roche–Trafalgar alignment with bearing Dv(Gracia) = 026º.

How to work it out in the exam

  1. Extend SE the line joining Cabo Roche and Cape Trafalgar lighthouses.
  2. Intersect it with the reciprocal bearing 206º from Punta de Gracia: 36º 00′ N, 005º 51.8′ W.

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.