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A Hrb= 10:00 nos encontramos situados a 3 millas al S verdadero de la luz del pantalán de la refinería de CEPSA, en San Roque. En ese momento damos rumbo a la luz verde del dique del Puerto de Ceuta. Cuando nos encontramos en la oposición Punta Carnero-Punta Europa ponemos rumbo de aguja 205°. El desvío de la aguja para este rumbo es 2°(+). Se pide calcular nuestra posición a Hrb= 11:30, sabiendo que la declinación magnética en la zona para ese día es de 3°(E) y que nuestra velocidad de máquinas durante toda la navegación es de 6 nudos.At 10:00, 3 miles South true of the CEPSA refinery pier light in San Roque, you head for Ceuta green breakwater light at 6 knots. On reaching the Punta Carnero–Punta Europa opposition you turn to Ra = 205º (deviation +2º, variation 3º E). Find your 11:30 position:

Show the answer

Correct answer: b) l = 35º 59.9' N; L = 005º 27.2' W.

Why it is correct

Departing at 10:00 from 3′ S of the CEPSA pier light in Algeciras Bay towards Ceuta, you cross the Punta Carnero–Punta Europa opposition after 2.8 miles. Running the remaining 6.2 miles (of 9 miles total in 1.5 h at 6 knots) on Rv = 205º + 5º = 210º reaches l = 35º 59.9′ N, L = 005º 27.2′ W at 11:30.

Why the others are not

  • a) Does not match completing 9 miles across both legs after turning onto Rv = 210º on the Carnero–Europa opposition.
  • c) Does not match completing 9 miles across both legs after turning onto Rv = 210º on the Carnero–Europa opposition.
  • d) Does not match completing 9 miles across both legs after turning onto Rv = 210º on the Carnero–Europa opposition.

How to work it out in the exam

  1. Plot from 3′ S of the CEPSA pier towards Ceuta until crossing the Carnero–Europa opposition (2.8 miles).
  2. With Ct = +3º + 2º = +5º (Rv = 210º), plot the remaining 6.2 miles to 35º 59.9′ N, 005º 27.2′ W.

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.