Huling update: 2026-04-14Kontak: [email protected]
Batayan ng sanggunian: mga konsepto ng IMO/COLREG/STCW, nautical practice, aprubadong dokumento ng barko, at mga tala ng kalkulasyon ng CaptainCalc. Laging i-verify ang mga desisyon sa operasyon gamit ang opisyal na sanggunian.
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Kalkulator ng Tidal Height (Rule of Twelfths)
Tantiyahin ang tidal height sa anumang punto ng tidal cycle gamit ang Rule of Twelfths. I-input ang LW at HW heights mula sa tide tables.
Formula reference & notes
The Rule of Twelfths divides a 6-hour tidal cycle into hourly increments where the tide rises/falls approximately 1 : 2 : 3 : 3 : 2 : 1 twelfths of the total range per hour.
Cumulative rise after each hour: 1/12, 3/12, 6/12, 9/12, 11/12, 12/12
⚠ This is an approximation for semi-diurnal tides. For accurate tidal work near dangerous shoals, always use official tide prediction software and correct for meteorological effects.
Cumulative rise after each hour: 1/12, 3/12, 6/12, 9/12, 11/12, 12/12
⚠ This is an approximation for semi-diurnal tides. For accurate tidal work near dangerous shoals, always use official tide prediction software and correct for meteorological effects.