SEA TOOLS · SEA CALCULATOR

Shipboard calculators

Seven shipboard calculators for passage planning, compass work, bunkers, currency, wind, units, and FWA/DWA. Draft survey lives in the Bulk Calculator.

ETA & distance

Manual distance NM, UTC offsets, speed ↔ ETA or required speed for a target arrival.

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Gyro & compass error

Navigational stars + Polaris, Sun/Moon/planets — Zn, gyro error, TVMDC.

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Bunker & fuel

ASTM 54A/54B/56 density, VCF, and metric tonnes in air.

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Currency

Convert with live rates; refresh to update stored values.

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True wind

Heading, SOG, apparent wind → TWS and TWD.

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Unit converter

Length, speed, pressure, and eight more maritime unit groups.

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FWA & DWA

Fresh-water and dock-water allowance from displacement and TPC/TPI.

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