Your 2239 position is LAT 41°08.5'N, LONG...

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Question 1 of 2066636eea28f7522a1c51ad47

Your 2239 position is LAT 41°08.5'N, LONG 71°53.3'W. You change course to 315°T, and you maintain RPM's for 9 knots. At 2329: Little Gull Island Light bears 253°T Race Rock Light bears 309°T Watch Hill Point Light bears 058°T What were the set and drift of the current you experienced from your 2239 position?

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Question 1 of 20

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🔍 Key Concepts

• Dead reckoning (DR) position vs. fix and how current affects the difference between them • Using three simultaneous lines of position (LOPs) to determine an accurate fix • Definition of set (direction current pushes you toward) and drift (speed of that push)

💭 Think About

• From your 2239 position and course/speed, where should your DR position be at 2329 if there were no current? • Once you plot the 2329 three-bearing fix, how do you draw and label the vector that represents the current’s effect between the DR and the fix? • After measuring that current vector, how do you convert its direction to set and its length over 50 minutes to drift in knots?

✅ Before You Answer

• Be sure your time interval from 2239 to 2329 is correct in minutes, then convert distance and speed consistently • Confirm you are measuring set as the direction TOWARD which the current carried you (from DR to fix), not the opposite • When converting the measured current distance in nautical miles over 50 minutes to knots, use the basic formula Speed = Distance / Time with time in hours

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