Your vessel is steering 096°T at 17 knots....

Question 1 / 2707066636ee928f7522a1c51a656

Question 1 of 2707066636ee928f7522a1c51a656

Your vessel is steering 096°T at 17 knots. At 1847 a light bears 057°T, and at 1916 the same light bears 033°T. What will be your distance off abeam?

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Question 1 of 27070

Your vessel is steering 096°T at 17 knots. At 1847 a light bears 057°T, and at 1916 the same light bears 033°T. What will be your distance off abeam?

🔍 Key Concepts

• Relative motion of bearing lines as your vessel moves on a straight course • The relationship between change in true bearing and the distance run to calculate closest point of approach (CPA) or distance abeam • Using basic trigonometry or the 4-bearing/2-bearing running fix idea to find distance off when a mark is abeam

💭 Think About

• Draw your vessel’s track and plot the two bearings from the same position line. How does the bearing change as you move along your course? • Think about the angle between your course (096°T) and each bearing to the light. How can that angle help you relate distance run to distance off? • Once you find the distance run between the two bearings, how can you use the angles to that light to form a right triangle and solve for the distance abeam?

✅ Before You Answer

• Compute the time run between the two observations and convert it to hours before finding distance run at 17 knots • Check the angle on the bow for each bearing (difference between course and bearing) and be sure you’re using the correct angle inside the triangle • Verify that the final distance off abeam is less than the distance run between the two bearings, and that your selected answer is consistent with the geometry of the situation

Question 1 of 27070

Your vessel is steering 096°T at 17 knots. At 1847 a light bears 057°T, and at 1916 the same light bears 033°T. What will be your distance off abeam?

11.4 miles

11.9 miles

9.9 miles

10.7 miles

Question 1 / 2707066636ee928f7522a1c51a656

Question 1 of 2707066636ee928f7522a1c51a656

Your vessel is steering 096°T at 17 knots. At 1847 a light bears 057°T, and at 1916 the same light bears 033°T. What will be your distance off abeam?

Back

Question 1 of 27070

Your vessel is steering 096°T at 17 knots. At 1847 a light bears 057°T, and at 1916 the same light bears 033°T. What will be your distance off abeam?