Busan to Wakayama-Shimotsu Ko — sea route & marine weather
The sea route from Busan (KRPUS) to Wakayama-Shimotsu Ko (JPWAK) is about 390 nm — about 39 hours at 10 kn. Along the route today (Sep 13): SW wind 1–17 kn, waves 0.2–1.3 m. The baseline track is drawn on the chart; Calculate replans it for your vessel and live weather.
Passage facts| Sea-route distance | 390 nm |
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| Passage time at 10 kn | about 39 hours |
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| Great-circle distance | 307 nm |
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| Busan | 35°6.0′N 129°2.0′E |
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| Wakayama-Shimotsu Ko | 34°12.0′N 135°8.0′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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| SW 1–17 kn | 24 kn | 0.2–1.3 m |
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| 1–16 kn | 18 kn | 0.2–1.4 m |
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| 2–19 kn | 19 kn | 0.2–1.7 m |
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| NE 2–25 kn | 24 kn | 0.3–2.1 m |
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| NE 4–25 kn | 26 kn | 0.2–2.1 m |
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| 3–23 kn | 26 kn | 0.2–3.0 m |
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| NNE 4–24 kn | 24 kn | 0.6–3.3 m |
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| NE 5–23 kn | 25 kn | 0.9–3.7 m |
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| NE 12–31 kn | 35 kn | 0.5–2.8 m |
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| NNE 22–43 kn | 63 kn | 0.6–2.1 m |
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Forecast from the NOAA GFS 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 Busan to Wakayama-Shimotsu Ko by sea?
The water route is 390 nm (722 km), computed on WXMarine's maritime routing network. The same distance applies on the return passage from Wakayama-Shimotsu Ko to Busan.
How long does the passage from Busan to Wakayama-Shimotsu 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 Busan and Wakayama-Shimotsu Ko today?
Along the route today, per the NOAA GFS run 2026-09-13 06z: SW wind 1–17 kn, waves 0.2–1.3 m. The day-by-day table on this page covers the next 10 days.