From your 1934 position, you change course...

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Question 1 of 2066636eea28f7522a1c51ac1a

From your 1934 position, you change course to pass 2.0 miles due north of Block Island Sound South Entrance Obstruction Lighted "BIS" Buoy. If you adjust your course only (while maintaining an engine speed of 14 knots) for a set and drift of 230°T at 3.5 knots, what is your ETA and distance off when abeam of Shagwong Reef Lighted Bell Buoy "7SR"?

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Question 1 of 20

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🔍 Key Concepts

• Effect of set and drift on course and speed made good • Time-speed-distance relationships at 14 knots and with current applied • Relative position when abeam of a mark and calculating distance off using plotting techniques

💭 Think About

• First, on your plotting sheet, draw the desired track that passes 2.0 miles due north of BIS, then apply the set and drift of 230°T at 3.5 knots to find the actual course to steer at 14 knots. • From the 1934 position, determine how long it takes (in minutes) to get to the abeam position of 7SR using speed made good along track, not just engine speed. • Once you know the time interval from 1934 to abeam 7SR, add it to the start time for ETA, then use your plot to measure the perpendicular distance from your vessel’s abeam position to 7SR for distance off.

✅ Before You Answer

• Verify your vector triangle: 14-knot engine speed vector plus 3.5-knot current vector should give you a track that passes 2.0 miles north of BIS. • Make sure you are using speed made good along the ground for time calculations, not through-the-water speed only. • Confirm that "abeam of 7SR" means drawing a line through 7SR perpendicular to your course over ground and using that point to measure distance off.

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