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A HRB = 13-10 en situación l = 35º-53,0’ N, L = 005º-46,0’ W se lleva Ra = 084º, dm = 3º NW, Desvío = 3º NW, Vhb = 7 nudos. Calcular la situación estimada a HRB = 15-30.At ship's time 13-10 at l = 35º-53.0'N, L = 005º-46.0'W we steer Ra = 084º, dm = 3º NW, Deviation = 3º NW, speed 7 knots. Calculate the estimated position at ship's time 15-30.
Show the answer
Correct answer: c) l = 35º-56.3'N, L = 005º-26.2'W
Why it is correct
Ct = −6, so true course is 078. In 2 h 20 min at 7 knots: 16.3 miles. That is 3.4′ north and 16 miles east, about 19.7′ of longitude.
Why the others are not
- a) It uses an uncorrected course or a longer time.
- b) Too much latitude for this course.
- d) Too much latitude for this course.
How to work it out in the exam
- Order: correct the course, work out distance, plot.
Where this question comes from
- Junta de Andalucía · 2015 · 2ª convocatoria · PER Modelo A · question 43 Official paper · Official answer key
- Junta de Andalucía · 2015 · 2ª convocatoria · PER Modelo B · question 44 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.