Tanker · Flag JP
RYOSEI MARU
RYOSEI MARU is a tanker (IMO 8944173, MMSI 431301018, flag JP). Its last AIS position was reported on 16 Oct 2026 at 09:34 UTC in Port of Yokosuka Ko, bound for >JP YOK XX NGI/LPG-1. AIS Trail recorded 1 port call in the last 60 days, most recently at Wakayama-Shimotsu Ko.
Last position
Status: Under way using engine · Destination as broadcast: >JP YOK XX NGI/LPG-1 · ETA as broadcast: 15 Oct 2026, 13:00 UTC
Position of MMSI 431301018, rounded to 0.01°; see the exact live position and the last 3 days on the live map.
Vessel details
| Name | RYOSEI MARU |
|---|---|
| IMO number | 8944173 |
| MMSI | 431301018 |
| Call sign | JL6618 |
| Type | Tanker |
| Flag | JP (from the MMSI country code) |
| Length × beam | 71 m × 11 m |
| Highest reported draught | 4.5 m (last 30 days) |
| Estimated deadweight | ≈ 2,080 t — estimated from AIS dimensions |
| Destination as broadcast | >JP YOK XX NGI/LPG-1 |
| Seen in AIS | 10 Oct 2026 – 16 Oct 2026 (last 30 days) |
Port calls
Port calls detected by AIS Trail in the last 60 days, newest first.
| Port | Arrived (UTC) | Departed (UTC) | Time in port |
|---|---|---|---|
| Wakayama-Shimotsu Ko JPWAK | 10 Oct 2026, 23:28 UTC | 13 Oct 2026, 23:19 UTC | 2 d 23 h |
RYOSEI MARU in the API
The full track, every port call and the live position of RYOSEI MARU are available through the AIS Trail API. A free key covers the last 7 days of history; paid plans cover the last 12 months, and Pro and Business add live positions.
curl -H "Authorization: Bearer $AIS_TRAIL_KEY" \
"https://api.aistrail.com/v1/vessels/imo/8944173/track?from=2026-10-10&resolution=1h"
curl -H "Authorization: Bearer $AIS_TRAIL_KEY" \
"https://api.aistrail.com/v1/vessels/imo/8944173/port-calls?from=2026-10-10"Sources
- Live AIS via aisstream.io, provided without warranty. No published terms
- Port reference: UN/LOCODE, United Nations Economic Commission for Europe (UNECE), https://unlocode.unece.org, license CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Modified: port entries selected, deduplicated and merged with the World Port Index.
- Port reference: World Port Index (Pub. 150), National Geospatial-Intelligence Agency (NGA).
Flags come from the MMSI country code, deadweight and size class are estimates from AIS dimensions, port calls are detected by AIS Trail from position reports. All sources and licences: Data sources.
Not for navigation. AIS data can be missing, delayed or wrong; do not use it for navigation, collision avoidance, search and rescue or any other safety-of-life purpose.
