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Estando situados en la luz roja del Puerto de Ceuta, ponemos rumbo para pasar a 5,2 millas del faro de Punta Europa, dejándolo a poniente. Hallar el rumbo de aguja si el desvío es 1,5º E y la declinación magnética es la de la carta para el año 2008.From the red entrance light of Ceuta port, you set course to pass 5.2 miles East of Punta Europa lighthouse (leaving it to westward) in 2008 with deviation 1.5º E. Find the compass course:
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Correct answer: c) Rºa = 017º.
Why it is correct
Laying the tangent from Ceuta red light to leave Punta Europa lighthouse 5.2 miles to westward (port) gives true course Rv = 016º. In 2008 charted variation (2º 50′ W 2005, 7′ E) is dm = 2º 29′ W ≈ −2.5º; with deviation +1.5º, Ct = −1º and Ra = 016º − (−1º) = 017º.
Why the others are not
- a) Does not apply Ct = −1º (variation −2.5º, deviation +1.5º) to true course Rv = 016º.
- b) Does not apply Ct = −1º (variation −2.5º, deviation +1.5º) to true course Rv = 016º.
- d) Does not apply Ct = −1º (variation −2.5º, deviation +1.5º) to true course Rv = 016º.
How to work it out in the exam
- Draw the tangent from Ceuta to a 5.2-mile arc east of Punta Europa: Rv = 016º.
- Update variation to 2008 (−2.5º), add deviation +1.5º (Ct = −1º) and find Ra = 016º + 1º = 017º.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2020 · Convocatoria de diciembre · PER Test 4 · question 42 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.