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Nos encontramos a 3 millas al Norte verdadero del faro de Cabo Negro (hacia el Sur de Ceuta). Calcular el rumbo de aguja para dirigirnos a un punto situado a 5 millas al NE verdadero (Nordeste) del faro de Punta Almina. Desvío de la aguja = + 5º (más) declinación magnética = 3º NELocated 3 miles due North true of Cabo Negro lighthouse (south of Ceuta), calculate the compass course to a point 5 miles NE true of Punta Almina lighthouse (deviation = +5º, variation = 3º NE):

Show the answer

Correct answer: a) 006º

Why it is correct

From 3 miles N of Cabo Negro (35º 44.3′ N, 005º 16.5′ W) to 5 miles NE (045º) of Punta Almina (35º 57.5′ N, 005º 12.1′ W), the charted true course is Rv = 014º. With Ct = +3º + 5º = +8º, the compass course is Ra = 014º − 8º = 006º.

Why the others are not

  • b) Does not subtract Ct = +8º from true course Rv = 014º between the two points.
  • c) Does not subtract Ct = +8º from true course Rv = 014º between the two points.
  • d) Does not subtract Ct = +8º from true course Rv = 014º between the two points.

How to work it out in the exam

  1. Plot 3′ N of Cabo Negro and 5′ NE of Punta Almina on the chart and measure the true course: Rv = 014º.
  2. With Ct = +3º + 5º = +8º, compute Ra = 014º − 8º = 006º.

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.