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A HRB= 1700 en situación WPT 00= 36º 10’N 005º 15’W dan rumbo sin viento ni corriente hacia el WPT 01= 36º 30'N – 003º 50'W y calculan el rumbo verdadero directo y la distancia directa:At ship’s clock 1700 at WPT 00 = 36º 10’N 005º 15’W they set course, with no wind or current, for WPT 01 = 36º 30'N – 003º 50'W and work out the direct true course and distance:
Show the answer
Correct answer: a) Rv= 074º - d=72.5’
Why it is correct
Δlat = 20′ N. Departure = 85′ × cos 36º20′ = 68.5′ E. Course 074º. Distance about 71 miles: the nearest option is 72.5.
Why the others are not
- b) It does not match the working.
- c) It does not match the working.
- d) It does not match the working.
How to work it out in the exam
- Find the difference of latitude and the departure: ΔL × cos(mean latitude).
- Course = arctan(A / Δlat). Distance = root of the sum of squares.
Where this question comes from
- Región de Murcia · 2020 · 1ª convocatoria · PY Tipo 1 · question 40 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.