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A Hrb= 13:00 nos encontramos situados a 3 millas al NW verdadero de Cabo Espartel. En ese momento damos rumbo a Punta de Gracia (Torre de Gracia), navegando a una velocidad de máquinas de 5 nudos. Tras haber navegado 5 millas, caemos a estribor, poniendo rumbo de aguja 086°, sin alterar la velocidad de máquinas. El desvío de la aguja para este rumbo es 1°(+). Continuamos navegando con el mismo rumbo y velocidad de máquinas. Se pide calcular nuestra posición a Hrb= 17:00, sabiendo que la declinación magnética en la zona para ese día es de 3°(E).At 13:00, 3 miles NW true of Cape Spartel, you head for Punta de Gracia at 5 knots. After 5 miles you alter to Ra = 086º (deviation +1º, variation 3º E) at 5 knots. What is your position at 17:00?

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Correct answer: d) l = 35º 54.2' N; L = 005º 37.0' W.

Why it is correct

From 3′ NW of Cape Spartel (35º 49.6′ N, 005º 58.1′ W), running 5 miles (1 h, to 14:00) towards Punta de Gracia reaches 35º 54.2′ N, 005º 55.5′ W. From 14:00 to 17:00 (3 h = 15 miles) on Ra = 086º with Ct = +3º + 1º = +4º (Rv = 090º, due East) brings you to l = 35º 54.2′ N, L = 005º 37.0′ W.

Why the others are not

  • a) Does not match running 5 miles towards Punta de Gracia followed by 15 miles due East (Rv = 090º).
  • b) Does not match running 5 miles towards Punta de Gracia followed by 15 miles due East (Rv = 090º).
  • c) Does not match running 5 miles towards Punta de Gracia followed by 15 miles due East (Rv = 090º).

How to work it out in the exam

  1. Plot 3′ NW of Spartel and advance 5 miles towards Punta de Gracia (14:00: l = 35º 54.2′ N, L = 005º 55.5′ W).
  2. With Ct = +4º, Rv = 086º + 4º = 090º; plot 15 miles due East to 35º 54.2′ N, 005º 37.0′ W.

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.