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

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Question 1 of 2066636eea28f7522a1c51b09a

You desire to make good a true course of 174°. The variation is 17°W, magnetic compass deviation is 4°W, and gyrocompass error is 4°E. A west-southwest 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

• Relationship between true, magnetic, and compass courses (TVMDC) • How to properly apply variation, deviation, and gyro error with correct algebraic signs • Effect of leeway from a west-southwest wind on the ship’s heading

💭 Think About

• Start from the desired true course and move step-by-step to find the standard magnetic compass course. Are you moving in the correct direction (adding vs. subtracting) at each step? • Think about a west-southwest wind: does that push your vessel’s head to the left or to the right of your intended track? How should your steered course be adjusted so your track made good stays at 174°T? • Separate the corrections: first get from true to magnetic, then to compass, then apply leeway. In what order should these be logically applied so that the result is the course you must steer?

✅ Before You Answer

• Confirm the sign convention for west variation and west deviation (do they make compass readings larger or smaller than true?). • Check whether gyro error East means the gyro reads higher or lower than true, and therefore whether you add or subtract it when comparing courses. • After computing your course, mentally picture the wind from WSW and verify that your final steered course is offset in a direction that would realistically compensate for the leeway.

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