The Coast Guard announces that Chesapeake...

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Question 1 of 2066636eea28f7522a1c51af67

The Coast Guard announces that Chesapeake Channel is closed indefinitely due to a collision in the channel between Trestle "B" and "C" of the Chesapeake Bay Bridge and Tunnel. You exit York Spit Channel, leaving buoy "22" close abeam to port at 0.1 mile, and alter course to leave Horseshoe Crossing Lighted Bell Buoy "HC" 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 bearings and abeam positions when passing buoys • Using a chart and plotting to determine the true course between two known positions • Converting true course to gyro course (pgc) using variation, deviation, or gyro error as given in the exam setup/table for this problem

💭 Think About

• From buoy 22 to buoy HC, how would you plot the track line on the chart and read the true course along that line? • Once you have the true course, what corrections do you normally apply to get a course per gyrocompass (pgc) in these types of exam problems? • Are you sure you are measuring the course in the correct direction (from your starting buoy to the next), not the reciprocal?

✅ Before You Answer

• Verify the correct charted positions for buoy 22 and buoy HC and that you are indeed going from York Spit Channel toward Horseshoe Crossing • Double‑check that you apply the correct sign and value of gyro error or variation/deviation as given in the problem’s reference tables or exam booklet • Confirm that the plotted course matches the general direction of travel shown on the chart (southbound vs. northbound and slight east/west component) before choosing the closest pgc option

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