Hover or tap underlined Spanish terms to see their translation and exam tip.
Navegando en el Estrecho de Gibraltar con Velocidad de máquinas = 4 nudos y Rumbo verdadero = 320º. A las 14:30 HRB se obtiene una distancia radar del faro Punta Paloma = 9 millas. A las 16:30 HRB se obtiene una Demora verdadera al faro de Punta Gracia = 021º. Calcúlese posición a las 16:30.In the Strait of Gibraltar at 4 knots on Rv = 320º, radar distance to Punta Paloma is 9 miles at 14:30, and at 16:30 true bearing to Punta de Gracia is 021º. Calculate your position at 16:30:
Show the answer
Correct answer: d) 36º 01.2' N 005º 50.6' W
Why it is correct
Between 14:30 and 16:30 (2 hours at 4 knots) the vessel runs 8 miles along Rv = 320º. Advancing the centre of the 9-mile range circle from Punta Paloma by 8 miles along 320º and intersecting that transferred arc with Dv(Punta de Gracia) = 021º (reciprocal 201º) gives 36º 01.2′ N, 005º 50.6′ W.
Why the others are not
- a) Does not advance the 9-mile arc from Punta Paloma by 8 miles along 320º to intersect Dv(Gracia) = 021º.
- b) Does not advance the 9-mile arc from Punta Paloma by 8 miles along 320º to intersect Dv(Gracia) = 021º.
- c) Does not advance the 9-mile arc from Punta Paloma by 8 miles along 320º to intersect Dv(Gracia) = 021º.
How to work it out in the exam
- Advance Punta Paloma lighthouse 8 miles along Rv = 320º and swing a 9-mile arc from that point.
- Intersect the transferred arc with bearing 201º from Punta de Gracia: 36º 01.2′ N, 005º 50.6′ W.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2019 · Convocatoria de junio · PY Test 1 · question 38 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2019 · Convocatoria de junio · PY Test 2 · question 37 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.