At 0705, you change course to head for The...

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Question 1 of 2066636eea28f7522a1c51a895

At 0705, you change course to head for The Race. You wish to leave Race Rock Light bearing due north at 0.4 mile. If the current is 110°T, at 2.8 knots, and you are turning for 12.0 knots, what course (pgc) should you steer?

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Question 1 of 20

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🔍 Key Concepts

• Plotting a course to steer (CTS) in current using a current triangle (set & drift vs. speed through the water) • Interpreting "leave a light bearing due north at 0.4 mile" as a track line offset from the aid to navigation • Converting from true course to pgc (per gyrocompass) using the gyro error/variation-deviation from earlier in the problem

💭 Think About

• On the chart, how do you draw the line that represents your desired track so that you will pass 0.4 NM from Race Rock Light when it bears 000°T? From which side of the light will you pass? • Once the desired track is drawn, how do you construct the current triangle using 12.0 knots through the water and a current of 2.8 knots set 110°T to find the true course to steer? • After you find the true course to steer, what correction do you need to apply to obtain a pgc course, and where in the exam problem set would you find that correction value?

✅ Before You Answer

• Verify you have drawn the offset track line 0.4 NM from Race Rock Light on the correct side, consistent with "bearing due north" when abeam. • Make sure your current vector is drawn with the correct set (110°T) and drift (2.8 kn), and that your ship’s speed vector is 12.0 kn along the desired track. • Before choosing an answer, confirm you converted from true course to pgc using the correct sign and magnitude for the gyro/compass error established earlier in the exam.

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