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A Hrb= 09:00 nos encontramos situados al Sur verdadero de Isla Tarifa, cuando con nuestra aguja obtenemos demora de Punta Alcázar = 109°. El desvío es 3° (+). En ese momento damos rumbo para pasar a 2 millas al Norte verdadero de Punta Cires. El desvío de la aguja para este rumbo es 2°(+). Mantenemos rumbo y velocidad hasta que obtenemos demora de aguja a Punta Carnero= 270° y demora de aguja a Punta Europa= 295°. En dicho instante damos rumbo al extremo Sur del espigón del Puerto de Sotogrande [Fl(3)G.11s4M], en las inmediaciones del Río Guadiaro. Se pide calcular nuestra posición a Hrb= 13:00, sabiendo que nuestra velocidad de máquinas para todo el ejercicio es de 6 nudos y la declinación magnética en la zona para ese día es de 2°(W).At 09:00 due South of Isla Tarifa with Da Punta Alcázar = 109º (deviation +3º, variation 2º W), you head for 2' N of Punta Cires at 6 knots until Da Carnero = 270º and Da Europa = 295º (deviation +2º), then head for Sotogrande breakwater. Find your 13:00 position:

Show the answer

Correct answer: d) l = 36º 07.5' N; L = 005º 15.8' W.

Why it is correct

At 09:00 (Ct = +1º, Dv Alcázar = 110º due south of Tarifa: 35º 53.5′ N, 005º 36.6′ W), you run towards 2′ N of Cires (Ct = 0º) until intersecting Dv(Carnero) = 270º and Dv(Europa) = 295º (36º 04.3′ N, 005º 17.5′ W), then head towards Sotogrande breakwater to complete 24 miles in 4 hours (13:00) at l = 36º 07.5′ N, L = 005º 15.8′ W.

Why the others are not

  • a) Does not match the position reached after 24 total miles along the two legs.
  • b) Does not match the position reached after 24 total miles along the two legs.
  • c) Does not match the position reached after 24 total miles along the two legs.

How to work it out in the exam

  1. Fix the start due S of Tarifa with Dv(Alcázar) = 110º and plot the leg to the 270º Carnero / 295º Europa fix.
  2. Subtract the first leg from the 24-mile total run (4 h at 6 knots) and plot the remainder towards Sotogrande: 36º 07.5′ N, 005º 15.8′ W.

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.