Encounter Frequency

Wave-encounter frequency seen by a moving ship: ω_e = ω − (ω²·V·cos μ)/g.

Weather

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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

\omega_e = \omega - \frac{\omega^2 V \cos \mu}{g}

Symbol	Meaning	Unit
$ω$	Wave frequency (absolute)	rad/s
$V$	Ship speed	m/s
$μ$	Angle between heading and wave direction	°
$\omega_e$	Encounter frequency	rad/s

Source: Lloyd (1998) - Seakeeping: Ship Behaviour in Rough Weather

Wave-encounter frequency seen by a moving ship: \u03c9_e = \u03c9 \u2212 (\u03c9\u00b2\u00b7V\u00b7cos \u03bc)/g.