You are running coastwise in hazy weather;...

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Question 1 of 2066636eea28f7522a1c51b534

You are running coastwise in hazy weather; the visibility improves just before you pass a lighthouse abeam. Your speed is 15 knots, and the lighthouse was abeam at 1015. At 1037 the lighthouse is 4 points abaft the beam. What is your distance off at the second bearing?

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Question 1 of 20

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🔍 Key Concepts

• 4-point bearing (45°) running fix and how distance run relates to distance off • Converting speed in knots and time in minutes to distance in nautical miles • Meaning of "4 points abaft the beam" in terms of relative bearing from the bow

💭 Think About

• How many nautical miles do you travel between 1015 and 1037 at 15 knots, and how do you compute that distance using time in hours? • For a 4-point bearing change (from abeam to 4 points abaft the beam), what special relationship exists between the distance run and your distance off the object at the later time? • Are you being asked for distance off at the first bearing or at the second bearing, and why does that matter in this classic running-fix setup?

✅ Before You Answer

• Convert 22 minutes at 15 knots into distance run in nautical miles before looking at the choices • Confirm that "abeam" means a 90° relative bearing and "4 points abaft the beam" is an additional 45° change, for a total of 135° off the bow • Verify that this is the standard 4-point bearing distance-off rule (second bearing distance off equals distance run between the beams), and then match your computed miles to the closest option

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