Dead Reckoning - Error Growth

Dead-reckoning position error growth from course, speed, leeway and current errors over elapsed time - the uncertainty budget for DR legs.

DRNavigationError

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\sigma_{DR} = \sqrt{(D \sin \sigma_C)^2 + (D \sigma_S)^2}

Symbol	Meaning	Unit
$D$	Distance on DR	nm
$\sigma_C, \sigma_S$	Course, speed errors	deg, %

Source: Bowditch Pub.9 Ch.23

Dead-reckoning position error growth from course, speed, leeway and current errors over elapsed time - the uncertainty budget for DR legs.