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En el instante en el que el buque se encuentra en la Oposicion P.Europa – P.Carnero, se tomar Da Punta Europa= 060º, Calcular la CT en ese momento.At the instant the vessel is on the Punta Europa–Punta Carnero opposition line, you observe a compass bearing to Punta Europa of Da = 060º. Calculate the total compass error (CT):

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Correct answer: c) Ct = 004º NE

Why it is correct

On the opposition line between Punta Carnero (36º 04.3′ N, 005º 25.4′ W) and Punta Europa (36º 06.5′ N, 005º 20.7′ W), the true bearing towards Punta Europa is Dv = 064º. Thus Ct = Dv − Da = 064º − 060º = +4º = 004º NE.

Why the others are not

  • a) Does not match Dv − Da = 064º − 060º = 004º NE (+4º).
  • b) Does not match Dv − Da = 064º − 060º = 004º NE (+4º).
  • d) Does not match Dv − Da = 064º − 060º = 004º NE (+4º).

How to work it out in the exam

  1. Measure on the chart the true bearing from Punta Carnero to Punta Europa: Dv = 064º.
  2. Subtract the compass bearing: Ct = 064º − 060º = 004º NE.

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.