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El día 16 de octubre de 2021, a las HRB: 13:12 con Rumbo verdadero 295º tomamos una marcación por estribor al faro de Punta de Gracia (Pta Camarinal) de 025º, a su vez, la demora de aguja al Faro de Punta de Gracia (Pta Camarinal) es de 320º. En el momento de la toma de la marcación sabemos que nos encontramos en la oposición entre el Faro de Isla Tarifa y el Faro de Punta Malabata. Desconociendo el desvío de aguja, ¿cuál se aproxima más a nuestro rumbo de aguja y coordenadas a las 13:12?On 16 October 2021 at 13:12 on true course 295º in the Isla Tarifa–Punta Malabata opposition, you take a 025º Starboard relative bearing and 320º compass bearing to Punta Camarinal. Find your compass course and position:

Show the answer

Correct answer: d) Ra = 295º; l = 35º 56.40' N; L = 005º 39.20' W

Why it is correct

True bearing to Punta Camarinal is Dv = Rv + M = 295º + 25º = 320º. Since Da = 320º, total compass error is Ct = Dv − Da = 0º, so Ra = Rv = 295º. Intersecting Dv = 320º to Camarinal with the Tarifa–Malabata opposition gives l = 35º 56.40′ N, L = 005º 39.20′ W.

Why the others are not

  • a) Does not match Ct = 0º (Ra = 295º) and the intersection with the Tarifa–Malabata opposition at 35º 56.4′ N, 005º 39.2′ W.
  • b) Does not match Ct = 0º (Ra = 295º) and the intersection with the Tarifa–Malabata opposition at 35º 56.4′ N, 005º 39.2′ W.
  • c) Does not match Ct = 0º (Ra = 295º) and the intersection with the Tarifa–Malabata opposition at 35º 56.4′ N, 005º 39.2′ W.

How to work it out in the exam

  1. Compute Dv = 295º + 25º = 320º; matching Da = 320º means Ct = 0º and Ra = 295º.
  2. Intersect the Tarifa–Malabata opposition line with bearing 320º to Camarinal: 35º 56.40′ N, 005º 39.20′ W.

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.