SEA CALCULATOR

ETA & distance

Passage planning worksheet: distance, speed, time zones, and ETA or required speed for arrival.

Example values — edit any field; results update as you type.

Passage

Distance

Reference distance — always check against your passage plan.

Departure port

Selected: Singapore

Arrival port

Selected: Rotterdam

Selected pair: Singapore → Rotterdam — 8439.5 NM (routed est.)

Departure label (editable)

Arrival label (editable)

Departure date/time (local)

Wall-clock time at departure; offset converts to UTC.

Departure zone

Pick civil UTC offset; optional +1 h DST on departure or arrival.

Arrival zone

Pick civil UTC offset; optional +1 h DST on departure or arrival.

Departure DST +1 hArrival DST +1 h

Departure UTC: 2026-09-25 00:00 · Arrival local zone UTC+2

Steady speed in knots for Speed → ETA.

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