You want to make good a true course of 137°....

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Question 1 of 2066636eea28f7522a1c51b874

You want to make good a true course of 137°. A north-northeast wind produces a 3° leeway. The variation is 11° west, deviation is 5° east, and gyrocompass error is 2° east. What course must you steer per gyrocompass to make the true course good?

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Question 1 of 20

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🔍 Key Concepts

• Effect of a crosswind (leeway) on your course through the water and whether you should apply it toward or away from the wind direction • The full conversion chain True – Variation – Deviation – Compass (T-V-M-D-C), and how the signs (E/W) affect whether you add or subtract • Relationship between true heading and gyrocompass course, including how to apply a known gyro error

💭 Think About

• First decide whether the leeway from a north-northeast wind will push your vessel to the left or right of your intended track and whether you must steer more into or away from the wind to compensate • Once you have the true course to steer (after leeway), carefully step it through variation and deviation to get the equivalent magnetic/standard compass course, paying close attention to whether east and west corrections are added or subtracted • After you have the correct true or magnetic reference, apply the given gyro error with the proper sign (east/west) to find what the gyro should read when you are actually on the desired true course

✅ Before You Answer

• Be sure you are starting from the true course to steer after leeway, not just the original required true course • Confirm the sign convention you are using: remember common rules like "east is least, west is best" or their gyro equivalents, and apply them consistently • Double-check that you ended with a per gyrocompass (pgc) value, not a standard magnetic compass value, before comparing your result to the choices

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