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Zarpamos del puerto de Barbate a HRB= 1000 con rumbo de aguja= 220º. (Variación local=2º W y desvío de aguja= +2º). Navegamos a velocidad del buque= 8 nudos. Calcule a qué distancia estaremos del faro de Trafalgar a HRB= 1130Leaving Barbate port at HRB = 1000 on compass course Ra = 220º (variation 2º W, deviation +2º) at 8 knots, how far will you be from Cape Trafalgar lighthouse at HRB = 1130?
Show the answer
Correct answer: a) 9.7'
Why it is correct
With variation −2º and deviation +2º, Ct = 0º and Rv = 220º. In 1.5 hours (10:00 to 11:30) at 8 knots you run 12 miles from Barbate (36º 11.3′ N, 005º 55.3′ W) to 36º 02.1′ N, 006º 04.8′ W, which lies 9.7 miles from Cape Trafalgar lighthouse.
Why the others are not
- b) Does not match the distance to Trafalgar after running 12 miles on Rv = 220º from Barbate.
- c) Does not match the distance to Trafalgar after running 12 miles on Rv = 220º from Barbate.
- d) Does not match the distance to Trafalgar after running 12 miles on Rv = 220º from Barbate.
How to work it out in the exam
- With Ct = 0º, plot 12 miles (1.5 h at 8 knots) along Rv = 220º from Barbate.
- Measure the distance from the reached position to Cape Trafalgar lighthouse: 9.7 miles.
Where this question comes from
- Región de Murcia · 2020 · 2ª convocatoria · PER Tipo 1 · question 44 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.