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USCG Exam Practice · Three-bearing fix and cocked-hat triangle

The doubling-the-angle technique is used to determine:

  1. AWhether constant bearing decreasing range (CBDR) exists with an approaching vessel
  2. BThe distance to an object at the time of the second bearing, using the distance run between the two bearings✓ correct
  3. CThe vessel's set and drift by comparing two simultaneous LOPs
  4. DThe accuracy of a three-bearing fix by measuring the area of the cocked hat

Why B is correct

In the doubling-the-angle technique, two relative bearings are taken to a single object such that the second bearing is double the first. The distance run between the two bearings equals the distance off the object at the time of the second bearing. Bowditch Ch. 7 §703.

Cited:Bowditch Ch. 7 §703

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The doubling-the-angle technique is used to determine: — USCG Exam Practice · CaptainsGround