You are steering a course of 240°T, and a...

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Question 1 of 2066636ee928f7522a1c51a1e7

You are steering a course of 240°T, and a lighthouse bears 025° on the starboard bow at 2116. At 2144 the same lighthouse bears 050° on the starboard bow, and you have run 6 miles since the first bearing. What is the ETA when the lighthouse is abeam?

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Question 1 of 20

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🔍 Key Concepts

• Relative bearings and abeam position (abeam = 090° or 270° relative to ship’s head) • Using two position lines (bearings) and distance run to find when a point will be abeam • Basic speed = distance / time to find vessel’s speed over the ground from given run and elapsed time

💭 Think About

• First, sketch your ship’s track on 240°T and plot the two lighthouse bearings (025° and 050°) from the ship, making sure they are relative to the ship’s heading, not true at first. • Use the 6 miles run between 2116 and 2144 along the 240°T track to scale your plot and determine your speed, then extend the track until the lighthouse will be exactly abeam. • From your plot, determine how much farther along the track you must travel from the 2144 position until the abeam point, then convert that extra distance to time using the speed you found.

✅ Before You Answer

• Confirm whether the given bearings (025° and 050° on the starboard bow) are relative bearings and correctly convert them to true bearings by adding them to the ship’s heading (240°T). • Double-check that your speed is computed correctly from the 6 miles run in the 28‑minute interval (2116–2144). • When the lighthouse is abeam, ensure you are using a 090° relative bearing on the starboard side from the ship’s head, converted properly to a true bearing for your final construction.

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