Hover or tap underlined Spanish terms to see their translation and exam tip.
Una embarcación que se sitúa en la enfilación del faro de Cabo Roche y el faro de Cabo Trafalgar obtiene una demora de aguja de este último faro igual a 323º. Calcular la corrección total (Ct) de la aguja náutica.A vessel on the leading line of Cabo Roche lighthouse and Cape Trafalgar lighthouse observes Cape Trafalgar lighthouse at a compass bearing of 323º. Calculate the total compass error (Ct):
Show the answer
Correct answer: a) Ct = 0º.
Why it is correct
On the leading line of Cabo Roche (36º 17.7′ N, 006º 08.4′ W) and Cape Trafalgar (36º 11.0′ N, 006º 02.0′ W) lighthouses, the true bearing towards both lights is Dv = 323º. Since Da = 323º, total compass error is Ct = Dv − Da = 0º.
Why the others are not
- b) Does not match the zero difference between Dv = 323º and Da = 323º.
- c) Does not match the zero difference between Dv = 323º and Da = 323º.
- d) Does not match the zero difference between Dv = 323º and Da = 323º.
How to work it out in the exam
- Measure on the chart the true bearing of the Cape Trafalgar–Cabo Roche alignment: Dv = 323º.
- Subtract the compass bearing: Ct = 323º − 323º = 0º.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2021 · Convocatoria de febrero · PER Test 5 · question 42 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.