Which of the following is one of the DR rules?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

Which of the following is one of the DR rules?

Dead reckoning relies on projecting your position from a last known fix using course, speed, and time. To keep that projection accurate, you update the DR whenever you have new position information. The standard DR rule is to revise the DR after every fix or running fix, because that provides an observed position to correct drift in the estimate. This keeps your DR current as you move. Other options don’t provide new observed position data to adjust the DR: changing course alters the forecast path but doesn’t supply a fresh position to reset from; updating on the hour may be too infrequent; plotting a line of position is part of plotting, not a correction itself.

Dead reckoning relies on projecting your position from a last known fix using course, speed, and time. To keep that projection accurate, you update the DR whenever you have new position information. The standard DR rule is to revise the DR after every fix or running fix, because that provides an observed position to correct drift in the estimate. This keeps your DR current as you move. Other options don’t provide new observed position data to adjust the DR: changing course alters the forecast path but doesn’t supply a fresh position to reset from; updating on the hour may be too infrequent; plotting a line of position is part of plotting, not a correction itself.

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