You desire to make good a true course of 129°. The variation is 7°E, magnetic compass deviation is 4°E, and gyrocompass error is 2°W. An easterly wind produces a 4° leeway. What is the course to steer per standard magnetic compass to make the true course good?

Question

You desire to make good a true course of 129&deg;. The variation is 7&deg;E, magnetic compass deviation is 4&deg;E, and gyrocompass error is 2&deg;W. An easterly wind produces a 4&deg; leeway. What is the course to steer per standard magnetic compass to make the true course good?

Accepted Answer

Option B: 114&deg;psc. Working backward from desired true course 129°: subtract 7° East variation to get magnetic 122°, subtract 4° East deviation for compass 118°. An easterly wind creates port leeway, which must be countered by steering 4° further right, resulting in 114°psc.

You desire to make good a true course of 129&deg;. The variation is 7&deg;E, magnetic compass deviation is 4&deg;E, and gyrocompass error is 2&deg;W. An easterly wind produces a 4&deg; leeway. What is the course to steer per standard magnetic compass to make the true course good?

You desire to make good a true course of 129°. The variation is 7°E, magnetic compass deviation is 4°E, and gyrocompass error is 2°W. An easterly wind produces a 4° leeway. What is the course to steer per standard magnetic compass to make the true course good?