Hover or tap underlined Spanish terms to see their translation and exam tip.
A HRB = 10:00 nos encontramos en la oposición de los faros de Isla de Tarifa y Pta.Malabata marcando en la oposición al faro de Isla de Tarifa en demora de aguja = 041º. Calcular la corrección total.At HRB 10:00 while on the opposition line of Isla de Tarifa and Punta Malabata lighthouses, you observe Isla de Tarifa lighthouse at a compass bearing of 041º. Calculate the total compass error:
Show the answer
Correct answer: b) + 6.5º (plus)
Why it is correct
On the opposition line between Punta Malabata and Isla de Tarifa lighthouses, the true bearing taken for the alignment is Dv = 047.5º. Subtracting the compass bearing Da = 041º gives total compass error Ct = 047.5º − 041º = +6.5º.
Why the others are not
- a) Reverses the sign of Dv − Da or uses a different angle for the opposition.
- c) Reverses the sign of Dv − Da or uses a different angle for the opposition.
- d) Reverses the sign of Dv − Da or uses a different angle for the opposition.
How to work it out in the exam
- Take the true bearing of the opposition towards Isla de Tarifa (047.5º).
- Subtract the compass bearing Da = 041º: Ct = +6.5º.
Where this question comes from
- Junta de Andalucía · 2017 · 2ª convocatoria · PY Módulo de navegación · question 13 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.