Kawasaki Ko to Otaru Ko — sea route & marine weather
The sea route from Kawasaki Ko (JPKWS) to Otaru Ko (JPOTR) is about 771 nm — about 3 days at 10 kn. Along the route today (Aug 3): NE wind 2–26 kn, waves 0.6–4.0 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 771 nm |
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| Passage time at 10 kn | about 3 days |
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| Great-circle distance | 465 nm |
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| Kawasaki Ko | 35°30.0′N 139°46.0′E |
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| Otaru Ko | 43°12.0′N 141°1.0′E |
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| Reference vessel | 4.5 m draft, 10 kn cruise |
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10-day marine forecast — along the route
| Date | Wind | Gusts | Waves |
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| NE 2–26 kn | 34 kn | 0.6–4.0 m |
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| NE 2–25 kn | 33 kn | 0.8–4.1 m |
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| ENE 2–22 kn | 31 kn | 0.8–3.6 m |
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| E 2–15 kn | 20 kn | 0.8–2.7 m |
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| SSE 2–23 kn | 29 kn | 1.0–2.3 m |
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| ESE 1–19 kn | 24 kn | 1.5–2.4 m |
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| NNE 4–19 kn | 23 kn | 1.2–2.8 m |
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| ENE 6–23 kn | 33 kn | 1.1–3.9 m |
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| S 3–27 kn | 42 kn | 1.8–3.3 m |
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| ENE 1–15 kn | 24 kn | 1.3–1.5 m |
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Forecast from the ECMWF IFS model run , waves from ECMWF WAM. Updated with each model cycle; the live chart below recalculates for your departure time and vessel.
Frequently asked
How far is it from Kawasaki Ko to Otaru Ko by sea?
The water route is 771 nm (1,427 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Otaru Ko to Kawasaki Ko.
How long does the passage from Kawasaki Ko to Otaru Ko take?
about 3 days at a 10 kn cruise. Scale by your own speed: at half the speed it takes about twice as long. The planner on this page recalculates for your vessel and live weather.
What is the weather between Kawasaki Ko and Otaru Ko today?
Along the route today, per the ECMWF IFS run 2026-08-03 12z: NE wind 2–26 kn, waves 0.6–4.0 m. The day-by-day table on this page covers the next 10 days.