At 0530, the Coast Guard announces that...

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Question 1 of 2066636eea28f7522a1c51a848

At 0530, the Coast Guard announces that Chesapeake Channel is closed indefinitely due to a collision occurring in the channel between Trestle "B" and "C" of the Chesapeake Bay Bridge and Tunnel. You exit York Spit Channel, leaving buoy "20" abeam to port at 0.1 mile, and alter course to leave Horseshoe Crossing Lighted Bell Buoy abeam to port at 0.2 mile. What is the course per gyrocompass?

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Question 1 of 20

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🔍 Key Concepts

• Relative bearing abeam and how to plot an abeam pass at a given distance off a buoy • Using the chart to find the true course between two waypoints, not just eyeballing the line • Converting true course to course per gyrocompass (pgc) using variation and gyro error

💭 Think About

• How do you plot the track line from buoy “20” (at the abeam point) to Horseshoe Crossing Lighted Bell Buoy (at its abeam point) and then measure the true course of that leg? • Once you have the true course from the chart, what corrections must you apply (and in what order) to get from true to gyro? • Are you sure you are plotting the abeam positions (0.1 NM and 0.2 NM off) correctly, rather than going from buoy-to-buoy? How does that change the measured course?

✅ Before You Answer

• Confirm the exact charted positions of buoy “20” and Horseshoe Crossing Lighted Bell Buoy on the exam training chart and mark the abeam passing points at the stated distances. • Check the variation and gyro error given in the exam problem or on the chart, and apply the correct sign convention (East/West, high/low) when converting to pgc. • Re‑measure the course with parallel rules after plotting the offset points to ensure your true course is accurate before converting it to pgc.

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