OIRASEMARU

Particulars

MMSI	431100911
Call sign	JE3178
Flag	Japan
Vessel type	Tug
Length overall	30 m
Beam	9 m

From her own AIS broadcasts.

Her MMSI

431100911

The first three digits, 431, are the country code of Japan: an MMSI follows a ship's flag, so a new flag brings a new number.

She broadcasts no IMO number. Only larger seagoing ships are required to have one.

Her AIS details

AIS is the radio signal a ship sends so that other ships can see her. This is what her signal tells us.

Seen from above, bow to the right, so port is the upper side. The ring is her GPS aerial, where her crew or installer said it sits. Shiptrail draws the aerial's position, not the middle of the ship.

AIS class	Class BWorked out, not reported: only Class A transponders send a status, and she sends none. Class B is the lighter kind on yachts, fishing boats and other small craft, which reports less often.
To the bow	10 m (A)
To the stern	20 m (B)
To the port side	4 m (C)
To the starboard side	5 m (D)
Heard from	AISStream
On the map since	31 Oct 2026, 20:21 UTC

A, B, C and D are AIS's own names for these four distances.

From her own AIS broadcasts as the feed delivers them.

Ships near her

KAIUNMARU0.2 nm
88KOYOMARU Fishing vessel0.3 nm
WAKASHIO MARU NO86 Fishing vessel0.4 nm
NO.85KOFUKUMARU Fishing vessel0.4 nm
EIHOUMARU NO31 Fishing vessel0.4 nm
GENEIMARU NO.12 Fishing vessel0.4 nm
WAZIMAMARU NO.23 Fishing vessel0.4 nm
EIHOUMARU NO.86 Fishing vessel0.4 nm

Where she is

Position	40.5339° N, 141.5334° E
Speed	1.4 knots
Course	60°
Local time

Voyage

From: Hachinohe, JapanDeparted 31 Oct 2026 (inferred)
To: Not reported
ETA: Not reported