Aikou Maru
Oil tanker · Japan · built 2012 · AIS Class A
In short
Aikou Maru (Oil tanker, Japan flag) was last seen on AIS on , at anchor, in the port of Chiba. Its crew-entered AIS destination is >JP CHB OFF, with an ETA of Oct 1, 2026, 16:30 UTC; its reported draught is 4.7 m (voyage report via AISstream.io global terrestrial AIS, received Oct 1, 2026, 13:39 UTC). It arrived there on Oct 1, 2026, 07:15 UTC.
- Vessel type
- Oil tanker
- Flag
- Japan
- Year built
- 2012
- Gross tonnage
- 1,960
- Size (length × beam)
- 89 m × 14 m
- Registered owner
- —
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Last reported position
received- Position
- 35.5878° N, 140.0428° E
- Area
- North Pacific Ocean
- StatusWhat do AIS statuses mean?
- At anchor
- Speed
- 0 kn
- Course
- 190°
- Heading
- 317°
Last 30 days: 3 port calls (Chiba and Kawasaki).
Port calls are detected by Seadar from AIS (at least 30 minutes slow inside a harbour area); see Port calls below.
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- Name
- Aikou Maru
- IMO numberWhat is an IMO number?
- 9658836
- MMSIWhat is an MMSI?
- 431003751
- Call signWhat is a call sign?
- JD3395
- Flag
- Japan
- Vessel type
- Oil tanker
- AIS ship type
- Tanker
- Gross tonnageGross tonnage vs deadweight
- 1,960
- Deadweight (DWT)
- Source: Wikidata, record Q117109814. Added to Seadar on September 23, 2026. Licence: CC0 1.0.3,306 t
- Length overall
- 89 m
- Beam
- 14 m
- Year built
- 2012
JapanA tag next to a value names the register that supplied it (hover or tap it for the record and date). Values without a tag come from the ship's own AIS broadcasts or from Wikidata. Position and identity are derived live from AIS.
Ownership & management
Each line shows where the fact comes from. Links backed by an identifier point to the company page.
- Builder
- Source: Wikidata · reported · confidence 0.8 · retrieved Sep 22, 2026
Timeline
Dated events for this ship from every source Seadar holds, newest first. Each line names its source; derived items say how they were derived.
| Date | Event | Source |
|---|---|---|
| Arrived at ChibaAIS-detected | Seadar port-call detector (AIS geofence) | |
| Left KawasakiAIS-detected | Seadar port-call detector (AIS geofence) | |
| Arrived at KawasakiAIS-detected | Seadar port-call detector (AIS geofence) | |
| Left ChibaAIS-detected | Seadar port-call detector (AIS geofence) | |
| Arrived at ChibaAIS-detected | Seadar port-call detector (AIS geofence) |
Owner, operator and manager changes found by comparing yearly EU MRV reports are dated to the reporting year ("during 2025"), not to a day. Port calls here are the most recent only; the full lists are further down.
Port calls
Two kinds of evidence, kept apart: calls Seadar detected from the ship's AIS positions, and arrivals and departures published by port authorities and customs records.
Detected from AIS AIS-detected
| Port | Arrived | Departed | Time in port |
|---|---|---|---|
| Chiba JPCHB | Oct 1, 2026, 07:15 UTC | in port | — |
| Kawasaki JPKWS | Sep 29, 2026, 09:07 UTC | Oct 1, 2026, 01:34 UTC | 40 h 27 min |
| Chiba JPCHB | Sep 25, 2026, 09:24 UTC | Sep 26, 2026, 03:19 UTC | 17 h 55 min |
Detected by Seadar when the ship's AIS positions stayed slow inside a harbour area. Calls shorter than 30 minutes are not shown. Depends on AIS reception; detection started on June 8, 2026.
Behaviour at sea Seadar-derived
Patterns Seadar derived from this ship's AIS broadcasts. They are inferences, not reports: each one shows how it was computed and how confident we are, and none of them says why a ship behaved this way.
| When | What we observed | Confidence |
|---|---|---|
| Oct 1, 2026, 07:09 UTC | Draught change Reported draught went from 5.7 m to 4.7 m after leaving Kawasaki. Seadar infers the ship probably discharged cargo. Method seadar.behaviour.draught_change v1 | Medium (55%) |
| Oct 1, 2026, 00:41 UTC | Draught change Reported draught went from 4.7 m to 5.7 m while in port at Kawasaki. Seadar infers the ship probably loaded cargo. Method seadar.behaviour.draught_change v1 | Medium (65%) |
| Sep 27, 2026, 02:37 UTC | Draught change Reported draught went from 5.6 m to 4.6 m after leaving Chiba. Seadar infers the ship probably discharged cargo. Method seadar.behaviour.draught_change v1 | Medium (55%) |
Source: AISstream.io global terrestrial AIS. AIS data: AISstream.io. Licence: none published.
Derived from AIS positions of feeds whose terms allow display on Seadar. Coverage is terrestrial: gaps are reported only where our receivers kept hearing other ships. Detections below medium confidence are not shown.
Frequently asked questions
- Where is Aikou Maru now?
- Aikou Maru (Oil tanker, Japan flag) was last seen on AIS on Oct 1, 2026, 13:05 UTC, at anchor, in the port of Chiba. The crew-entered destination was >JP CHB OFF (voyage report via AISstream.io global terrestrial AIS, received Oct 1, 2026, 13:39 UTC). This report does not confirm the ship’s current route.
- What kind of ship is Aikou Maru?
- Aikou Maru is an oil tanker sailing under the flag of Japan, built in 2012 by Yamanaka Shipbuilding. The vessel is 89 m long with a beam of 14 m and has a gross tonnage of 1,960.
- What sanctions and inspection records does Seadar hold for Aikou Maru?
- Seadar has no matched sanctions record displayed for Aikou Maru from the OFAC SDN list, the UK Sanctions List, the Canadian autonomous sanctions list, the EU list of designated vessels and the New Zealand Russia Sanctions Register. Coverage may be incomplete; this is not sanctions clearance. No matched inspection records are displayed for Aikou Maru. Missing records do not establish whether the ship has been detained.
Neighbouring IMO numbers
IMO numbers are issued in sequence. These are the nearest numbers below and above this ship's that have a full Seadar profile.
Use this data
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