USCG Exam Practice · Dead reckoning — DR plot maintenance
A fix, as distinguished from a line of position, requires which of the following?
- AA single bearing advanced along the DR track to a later time
- BThe intersection of two or more LOPs taken simultaneously✓ correct
- CCourse steered and distance run applied from a known position
- DA depth sounding compared against a charted contour line
Why B is correct
Bowditch Ch. 7 §701 defines a fix as the intersection of two or more LOPs taken simultaneously. A single observation yields only an LOP; advancing an LOP along the DR track produces a running fix, not a fix.
Cited:Bowditch Ch. 7 §701
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