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Nos encontramos navegando con velocidad de máquinas 6 nudos, y a Hrb = 09:30 situados en posición 35°47,0´N; 006°12,0´W damos rumbo a un punto “p” de coordenadas: 35°58,0´N; 005°55,0W; puestos a rumbo el desvío es de 3°(-). Cuando Cabo Espartel nos demora por el 116° de aguja, damos rumbo para pasar a 3 millas al Norte verdadero de Punta Malabata, manteniendo la misma velocidad de máquinas. Se pide calcular la posición de nuestra embarcación a Hrb=12:30, sabiendo que la declinación magnética para todo el ejercicio es 3°W.At 09:30 in 35º 47.0' N, 006º 12.0' W you head at 6 knots towards point P (35º 58.0' N, 005º 55.0' W) with deviation –3º and variation 3º W. When Cape Spartel bears 116º compass, you turn to pass 3 miles North true of Punta Malabata. Find your 12:30 position:

Show the answer

Correct answer: b) l = 35º 51.7' N; L = 005º 51.4' W.

Why it is correct

Along the track from 35º 47.0′ N, 006º 12.0′ W towards P, when Cape Spartel bears Da = 116º (with Ct = −6º, Dv = 110º) you have run 8.2 miles. Running the remaining 9.8 miles (of 18 miles in 3 h at 6 knots to 12:30) towards the point 3′ N of Punta Malabata reaches l = 35º 51.7′ N, L = 005º 51.4′ W.

Why the others are not

  • a) Does not match the position after completing the 18 total miles (3 h at 6 knots) across both legs.
  • c) Does not match the position after completing the 18 total miles (3 h at 6 knots) across both legs.
  • d) Does not match the position after completing the 18 total miles (3 h at 6 knots) across both legs.

How to work it out in the exam

  1. Draw the line from start to P and intersect it with Dv(Spartel) = 116º − 6º = 110º (8.2 miles).
  2. From that intersection plot the remaining 9.8 miles (18 − 8.2) towards 3′ N of Malabata: 35º 51.7′ N, 005º 51.4′ W.

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.