You desire to make good a true course of...

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Question 1 of 2066636eea28f7522a1c51b09e

You desire to make good a true course of 279°. The variation is 8°W, magnetic compass deviation is 3°E, and gyrocompass error is 1°E. A north-northwesterly wind produces 3° leeway. What is the course to steer per standard magnetic compass (psc) to make the true course good?

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Question 1 of 20

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🔍 Key Concepts

• True–to–Compass conversion sequence (True, Variation, Deviation, Compass – often remembered as "True Virgins Make Dull Company" or similar mnemonics) • Effect of west/east variation and deviation on going from True to Compass (add west, subtract east) • How to apply leeway (caused by wind) to the course you steer vs. the course you want to make good

💭 Think About

• Start from the desired True course (279°T) and convert step-by-step to what you must steer on the standard magnetic compass. What sequence should you use, and what signs (add/subtract) go with W or E corrections? • Think carefully about leeway from a north‑northwesterly wind. Does that wind push you to the left (port) or right (starboard) of your intended track, and therefore must you steer more into or away from the wind? • Compare the intermediate angles: What is your course magnetic before leeway, and how does leeway change the heading you must steer?

✅ Before You Answer

• Be consistent with the sign convention: when converting from True to Magnetic, how do you handle 8°W variation? When going from Magnetic to Compass, how do you handle 3°E deviation? • Verify you are steering a course that compensates for leeway, not changing the true course itself; leeway affects the heading you steer so that the track made good is 279°T. • Double‑check the final answer is expressed as per standard magnetic compass (psc), not gyro, and that you have not used the gyro error in the final compass-course calculation.

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