You are on course 006° T, speed 16.6 knots....

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Question 1 of 2066636eea28f7522a1c51afa6

You are on course 006° T, speed 16.6 knots. At 0516 you see a light bearing 008° T at a range of 10.2. If you change course at 0528 to leave the light abeam to port at 1.0 mile, at what time will the light be abeam?

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Question 1 of 20

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🔍 Key Concepts

• Relative motion between own ship and the light when altering course to leave it abeam • Using speed–time–distance to find how long it takes to change the bearing from slightly on the bow to exactly abeam • Geometry of the situation after the course change: knowing the desired closest point of approach (CPA) to the light is 1.0 mile abeam to port

💭 Think About

• First, find how far you travel between initially sighting the light and the time you alter course. How does this change the range and relative position of the light? • After the course change, imagine (or sketch) the triangle formed by your new track, the line of bearing when the light is abeam, and the line from your position at course change to the light. What distance along the new track corresponds to the light being 1.0 mile abeam? • Once you know the distance to run on the new course until the light is abeam, convert that distance to time using your speed. Then add that time to the course‑change time to compare with the answer choices.

✅ Before You Answer

• Be clear about which times go with which legs: 0516 for first sighting, 0528 for the course change, and the unknown time when the light is abeam. • Confirm that you are using speed in knots and distance in nautical miles, with the relationship: Time (hours) = Distance / Speed. • Double‑check that your geometry or plotting yields a perpendicular distance of 1.0 NM from your new track to the light when it is abeam to port.

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