At 0620 your GPS position is LAT 41°01.8'N,...

Question 1 / 2066636eea28f7522a1c51a875

Question 1 of 2066636eea28f7522a1c51a875

At 0620 your GPS position is LAT 41°01.8'N, LONG 72°48.40'W. You are steering course 274° per standard magnetic compass at a speed of 10 knots. At 0735 you fix your position by plotting several compass bearings on nearby known fixed objects. These result in a position of LAT 40°59.50'N, LONG 73°06.50'W. What were your set and drift?

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🔍 Key Concepts

• Dead reckoning (DR) track from course and speed over the time run • Difference between intended track (DR position) and fix (position made good) to find set and drift • Converting distance in nautical miles and time in hours to drift (knots)

💭 Think About

• First, compute how far you should have traveled from 0620 to 0735 at 10 knots and plot that DR position from the starting GPS position. Where does that DR point lie? • Next, draw a vector from the DR position to the 0735 fix. In which true direction does that vector point, and how long is it in nautical miles? • Finally, relate the length of that vector to the elapsed time to determine the speed of the current. Which answer choice matches that direction and speed?

✅ Before You Answer

• Verify the elapsed time between 0620 and 0735 and convert it correctly to hours (decimal). • Carefully measure the distance and direction from DR position to the fix; remember that set is the direction toward which the current flows (°T). • Double-check that your computed drift (nm per hour) matches one of the listed speeds in knots before picking an answer.

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Question 1 of 20

304°T at 0.8 knot

276°T at 1.2 knots

099°T at 0.5 knot

094°T at 1.3 knots

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Question 1 / 2066636eea28f7522a1c51a875

Question 1 of 2066636eea28f7522a1c51a875

Back

Question 1 of 20

66636eea28f7522a1c51a875

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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