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Navegamos a rumbo de aguja (Ra) de 250° y al encontrarnos en la oposición de los faros de Punta Carnero y Punta Cires tomamos una marcación (M) del faro de Punta Cires de 049°. Calcular la corrección total (Ct).Steering compass course Ra = 250° while on the opposition line of Punta Carnero and Punta Cires lighthouses, you take a relative bearing (M) of 049° to Punta Cires lighthouse. Calculate the total compass error (Ct):
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Correct answer: d) -6°.
Why it is correct
With Punta Cires bearing 049º on the port bow from Ra = 250º (compass bearing Da = 250º − 49º = 201º along the Carnero–Cires opposition line, where charted true bearing is Dv = 195º), total compass error is Ct = Dv − Da = 195º − 201º = −6º.
Why the others are not
- a) Reverses the sign of Dv − Da or adds the relative bearing to starboard instead of port.
- b) Reverses the sign of Dv − Da or adds the relative bearing to starboard instead of port.
- c) Reverses the sign of Dv − Da or adds the relative bearing to starboard instead of port.
How to work it out in the exam
- Compute the compass bearing to Punta Cires (Da = 250º − 49º = 201º) and measure Dv = 195º on the Carnero–Cires opposition.
- Find total compass error: Ct = 195º − 201º = −6º.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2020 · Convocatoria de diciembre · PY Test 1 · question 39 Official paper · Official answer key
Try it: Navigation calculations
Pending instructor review. Machine translation, not reviewed.