Daesan/Seosan (KRTSN) — marine weather & port guide
Daesan/Seosan is a port in South Korea at 37°0.0′N 126°22.0′E. Today (Aug 3): N wind 4–8 kn, waves 0.2–0.2 m, from the ECMWF IFS run 2026-08-03 12z. The live chart on this page shows current conditions and plans weather-optimized departures from this harbor.
Port facts (NGA World Port Index)| Position | 37°0.0′N 126°22.0′E |
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| UN/LOCODE | KRTSN |
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| Harbor size | Very small |
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| Harbor type | Open roadstead |
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| Shelter | Fair |
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| Channel depth | 20 m |
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| Anchorage depth | 23 m |
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| Tide range | 1 m |
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| Pilotage | Advisable |
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| Time zone | Asia/Seoul |
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10-day marine forecast — Daesan/Seosan
| Date | Wind | Gusts | Waves |
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| N 4–8 kn | 10 kn | 0.2–0.2 m |
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| NNW 4–9 kn | 11 kn | 0.1–0.2 m |
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| NNE 5–11 kn | 13 kn | 0.1–0.3 m |
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| NE 5–9 kn | 11 kn | 0.2–0.3 m |
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| NE 5–13 kn | 16 kn | 0.2–0.4 m |
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| E 9–11 kn | 14 kn | 0.3–0.5 m |
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| ENE 13–15 kn | 19 kn | 0.6–0.7 m |
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| E 9–9 kn | 11 kn | 0.6–0.6 m |
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| SE 5–5 kn | 10 kn | 0.5–0.5 m |
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| ESE 7–7 kn | 11 kn | 0.4–0.4 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 is the weather at Daesan/Seosan right now?
As of the ECMWF IFS run 2026-08-03 12z: N wind 4–8 kn, waves 0.2–0.2 m. The 10-day outlook is in the forecast table on this page and updates with each model cycle.
How big is the harbor at Daesan/Seosan?
Daesan/Seosan is classed as a very small harbor (open roadstead), with fair shelter in the NGA World Port Index.
How deep is the approach to Daesan/Seosan?
Per the NGA World Port Index, the entrance channel carries about 20 m and anchorage depths run about 23 m. Verify against current official charts before entry.
What restricts entry to Daesan/Seosan?
Entry is affected by tidal windows, heavy swell. Check the live forecast on this page and official notices before approach.