Hover or tap underlined Spanish terms to see their translation and exam tip.
A las 17:00 Hrb, navegando al rumbo verdadero 270°, tomamos una demora de aguja al Faro de Cabo Espartel de 230°. Simultáneamente tomamos otra demora de aguja al Faro de Punta Malabata de 140°. La corrección total de la carta es 5º (-). Se pide determinar nuestra posición más aproximada.At 17:00 Hrb steering true course 270°, you simultaneously take compass bearings Da Cape Spartel = 230° and Da Punta Malabata = 140° with total compass error Ct = –5º. Determine your position:
Show the answer
Correct answer: a) l = 35° 52.6' N; L = 005° 49.2' W.
Why it is correct
With Ct = −5º, true bearings are Dv(Spartel) = 230º − 5º = 225º and Dv(Malabata) = 140º − 5º = 135º. Plotting their reciprocals from each light (045º from Spartel and 315º from Malabata) intersects at l = 35º 52.6′ N, L = 005º 49.2′ W.
Why the others are not
- b) Does not match the charted intersection of Dv(Spartel) = 225º and Dv(Malabata) = 135º.
- c) Does not match the charted intersection of Dv(Spartel) = 225º and Dv(Malabata) = 135º.
- d) Does not match the charted intersection of Dv(Spartel) = 225º and Dv(Malabata) = 135º.
How to work it out in the exam
- Compute Dv(Spartel) = 225º and Dv(Malabata) = 135º by subtracting 5º from each compass bearing.
- Plot the position lines from both lights: they intersect at 35º 52.6′ N, 005º 49.2′ W.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de noviembre · PER Test 1 · question 43 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de noviembre · PER Test 3 · question 42 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.