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USCG Exam Practice · Dead reckoning — DR plot maintenance

A navigator obtains a bearing on a lighthouse at 0900 and cannot obtain a second simultaneous LOP. At 0930 a second bearing is taken on the same lighthouse. To determine position, the navigator advances the 0900 LOP along the DR track to 0930. The resulting position is called a:

  1. AFix
  2. BDead reckoning position
  3. CRunning fix✓ correct
  4. DEstimated position

Why C is correct

Bowditch Ch. 7 §702 defines a running fix as the position obtained by advancing an earlier LOP along the DR track to the time of a second observation when simultaneous LOPs cannot be taken. A fix requires two or more LOPs taken simultaneously per Bowditch Ch. 7 §701.

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A navigator obtains a bearing on a lighthouse at 0900 and cannot ob… — USCG Exam Practice · CaptainsGround