You make good this course at 12.5 knots...

Question 1 of 31048fork_2cc085f594514538b05

You make good this course at 12.5 knots until you are abeam Thimble Shoal Channel Lighted Buoy R"2” at 0820. At 0820, you change course to 287°T. What time will you pass between Trestle “A” and Trestle “B”?

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Question 1 of 31048

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🔍 Key Concepts

• Step 10’s 0800 fix and 285°pgc course establish the inbound position and route through the authorized channel toward the Trestle A–B opening. • At 0820, the vessel is abeam Thimble Shoal Channel Lighted Buoy R “2” and changes to 287°T; use that as the starting point for the final leg. • Use distance ÷ speed to find the elapsed time from the 0820 position to the opening; measure along the plotted true course, not from the deviation table.

💭 Think About

• From the 0800 fix in step 8, follow the course in step 10 at 12.5 knots and identify the 0820 abeam position at R “2.” What point on the chart marks passage between the trestles? • From the stated 0820 position, plot 287°T to the trestle opening and measure the remaining distance in nautical miles. How long does that distance take at 12.5 knots? • After finding the elapsed minutes, add them to 0820 and compare the resulting time with the choices.

✅ Before You Answer

• Confirm the 0820 abeam position on the chart before measuring the final leg. • Measure distance along the plotted 287°T track to the opening; do not apply magnetic deviation or gyro error to a course already stated as true. • Convert the travel time to minutes and check that the result is consistent with the answer choices.