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Navegando al Rumbo verdadero=072º a una velocidad de máquinas de 8 nudos, observamos a la Hrb 16:06 el Faro de Punta Europa con una demora verdadera= 020º. Manteniendo rumbo y velocidad observamos el Faro de Punta Almina con una demora verdadera = 175º a la Hrb 16:36. Hallar la situación no simultánea más aproximada a la Hrb 16:36.Steering Rv = 072º at 8 knots, you observe Punta Europa lighthouse at Dv = 020º at 16:06, and maintaining course and speed you observe Punta Almina lighthouse at Dv = 175º at 16:36. Find your 16:36 running fix:
Show the answer
Correct answer: a) 36º 03.6' N; 005º 17.9' W.
Why it is correct
In the 30 minutes from 16:06 to 16:36 at 8 knots you run 4 miles along Rv = 072º. Advancing the first bearing line Dv(Punta Europa) = 020º (reciprocal 200º) by 4 miles along 072º and intersecting it with the second bearing Dv(Punta Almina) = 175º (reciprocal 355º) gives 36º 03.6′ N, 005º 17.9′ W.
Why the others are not
- b) Does not advance the first Punta Europa bearing 4 miles along 072º to intersect Dv(Almina) = 175º.
- c) Does not advance the first Punta Europa bearing 4 miles along 072º to intersect Dv(Almina) = 175º.
- d) Does not advance the first Punta Europa bearing 4 miles along 072º to intersect Dv(Almina) = 175º.
How to work it out in the exam
- Plot bearing 200º from Punta Europa and advance it 4 miles (30 min at 8 knots) along Rv = 072º.
- Intersect the transferred line with 355º from Punta Almina: 36º 03.6′ N, 005º 17.9′ W.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de diciembre · PY Test 1 · question 32 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de diciembre · PY Test 2 · question 36 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.