Hover or tap underlined Spanish terms to see their translation and exam tip.
Hallándose una embarcación en la oposición de la marca cardinal norte cercana a Punta Malabata y el faro de Punta de Gracia, hallar la corrección total si la demora de aguja a dicha marca cardinal es de 176°.A vessel on the opposition line between the North cardinal mark off Punta Malabata and Punta de Gracia lighthouse observes that cardinal mark at compass bearing 176°. Find the total compass error:
Show the answer
Correct answer: c) 4° (-).
Why it is correct
Joining Punta de Gracia lighthouse (36º 05.4′ N, 005º 48.6′ W) to the North cardinal mark off Punta Malabata gives a true bearing towards the mark of Dv = 172º. Therefore Ct = Dv − Da = 172º − 176º = −4º.
Why the others are not
- a) Does not subtract Da = 176º from the true bearing Dv = 172º of the opposition.
- b) Does not subtract Da = 176º from the true bearing Dv = 172º of the opposition.
- d) Does not subtract Da = 176º from the true bearing Dv = 172º of the opposition.
How to work it out in the exam
- Measure on the chart the true bearing from Punta de Gracia to the Malabata North cardinal mark: Dv = 172º.
- Compute Ct = Dv − Da = 172º − 176º = −4º.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de octubre · PER Test 2 · question 44 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de octubre · PER Test 4 · question 44 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.