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Al encontrarnos en situación 36º 00,0′ N, 005º 40,0′ W damos rumbo a pasar a 5 millas del faro de Cabo Trafalgar. Sopla viento del nordeste (NE) que nos produce un abatimiento de 12º. Declinación magnética = 4º W, desvío de la aguja = –6º (menos). Calcular el rumbo de aguja.In position 36º 00.0' N, 005º 40.0' W you set course to pass 5 miles off Cape Trafalgar lighthouse with a NE wind causing 12º leeway (variation 4º W, deviation –6º). Calculate the compass course Ra:

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Correct answer: b) 310º

Why it is correct

From 36º 00.0′ N, 005º 40.0′ W the tangent to pass 5 miles off Cape Trafalgar lighthouse gives surface course Rs = 288º. With a NE wind on the starboard side (12º port leeway), steer 12º to starboard: Rv = 288º + 12º = 300º. With Ct = −4º − 6º = −10º, the compass course is Ra = 300º + 10º = 310º.

Why the others are not

  • a) Subtracts instead of adding the 12º leeway or the 10º negative compass error.
  • c) Subtracts instead of adding the 12º leeway or the 10º negative compass error.
  • d) Subtracts instead of adding the 12º leeway or the 10º negative compass error.

How to work it out in the exam

  1. Draw from 36º 00.0′ N, 005º 40.0′ W the tangent 5 miles off Cape Trafalgar: Rs = 288º.
  2. Add 12º for NE leeway (Rv = 300º) and add 10º for Ct = −10º: Ra = 310º.

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.