At 0815, Montauk Pt. Light House is bearing...

Question 1 of 29218fork_3cfba0c6e3dd4d448e9

At 0815, Montauk Pt. Light House is bearing 172°T, Shagwong Pt. has a radar range of 4.5 miles. If the engine was making turns for 10 knots, what was the current since 0748?

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Question 1 of 29218

At 0815, Montauk Pt. Light House is bearing 172°T, Shagwong Pt. has a radar range of 4.5 miles. If the engine was making turns for 10 knots, what was the current since 0748?

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🔍 Key Concepts

• Plotting a DR (dead reckoning) track using speed and time from 0748 to 0815 • Using a bearing and a radar range to obtain a fix and compare DR position to fix • Determining set (direction of current) from DR-to-fix line and drift (speed of current) from distance over time

💭 Think About

• From 0748 to 0815, how many minutes have passed, and what DR distance would you travel at 10 knots in that time? • Once you plot your DR position at 0815, where is your actual fix relative to that DR position (direction and distance)? • How do you convert the direction from the DR position to the fix into a true bearing for set, and how do you turn the distance difference over the elapsed time into knots for drift?

✅ Before You Answer

• Be sure your elapsed time between 0748 and 0815 is correct and expressed in hours for speed calculations • Confirm that your DR course and speed are correctly applied from the earlier fix/position to 0815 • Measure the direction from DR position to the 0815 fix for set, and divide the separation distance by elapsed time to get drift in knots