Tokyo to Kochi Ko — sea route & marine weather
The sea route from Tokyo (JPTYO) to Kochi Ko (JPKCZ) is about 392 nm — about 39 hours at 10 kn. Along the route today (Aug 3): S wind 1–26 kn, waves 0.2–4.0 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 392 nm |
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| Passage time at 10 kn | about 39 hours |
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| Great-circle distance | 333 nm |
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| Tokyo | 35°41.0′N 139°45.0′E |
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| Kochi Ko | 33°30.0′N 133°34.0′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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| S 1–26 kn | 34 kn | 0.2–4.0 m |
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| SSE 0–25 kn | 33 kn | 0.2–4.4 m |
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| SSW 2–27 kn | 36 kn | 0.3–5.5 m |
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| SSW 2–28 kn | 36 kn | 0.6–5.7 m |
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| SW 2–21 kn | 29 kn | 0.8–4.8 m |
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| NW 0–17 kn | 21 kn | 0.6–3.4 m |
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| ENE 2–13 kn | 16 kn | 0.4–2.8 m |
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| S 1–16 kn | 22 kn | 0.3–3.0 m |
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| S 1–7 kn | 14 kn | 0.5–2.4 m |
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| SSE 1–10 kn | 13 kn | 0.4–1.8 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 Tokyo to Kochi Ko by sea?
The water route is 392 nm (726 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Kochi Ko to Tokyo.
How long does the passage from Tokyo to Kochi Ko take?
about 39 hours 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 Tokyo and Kochi Ko today?
Along the route today, per the ECMWF IFS run 2026-08-03 12z: S wind 1–26 kn, waves 0.2–4.0 m. The day-by-day table on this page covers the next 10 days.