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DEAD RECKONING
DEFINITION AND PURPOSE
700. Definition and Use
Dead reckoning is the process of determining one’s
present position by projecting course(s) and speed(s) from
a known past position, and predicting a future position by
projecting course(s) and speed(s) from a known present
position. The DR position is only an approximate position
because it does not allow for the effect of leeway, current,
helmsman error, or compass error.