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

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Question 1 of 2066636ee928f7522a1c51957a

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?

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Question 1 of 20

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🔍 Key Concepts

• True, Magnetic, Compass (T–M–C) relationship and how to apply variation and deviation with correct signs • How gyro error and leeway affect the course you must steer versus the course you want to make good • Difference between standard magnetic compass course (psc) and true course

💭 Think About

• Start from the desired true course and work step‑by‑step through variation and deviation to find what the standard magnetic compass should read. Ask yourself: Are easterly variations and deviations added or subtracted when going from True to Compass? • Think carefully about leeway: If the wind is from the east causing you to drift to leeward, do you need to point the bow more into the wind (toward the east) or away from it (toward the west) to make good the desired true course? • Consider where gyro error enters the picture: do you actually need it here to get from True to Standard Magnetic Compass, or can it be ignored in this particular conversion?

✅ Before You Answer

• Be sure of the sign convention: "East is least, West is best" when converting between True and Magnetic, and how that affects the direction of your arithmetic. • Confirm whether psc (per standard compass) means before or after applying deviation (think: standard compass vs. steering compass). • After calculating, check whether your final course to steer makes sense: with an easterly wind and leeway applied, should the numerical course you steer be higher or lower than the desired true course?

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