HOUEIMARU NO.3

Particulars

MMSI	431029707
Call sign	JH3420
Flag	Japan
Vessel type	Tanker
Length overall	40 m
Beam	10 m

From her own AIS broadcasts.

Her MMSI

431029707

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	30 m (A)
To the stern	10 m (B)
To the port side	3 m (C)
To the starboard side	7 m (D)
Heard from	AISStream
On the map since	31 Oct 2026, 20:47 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

RYUEI MARU NO.2 Tanker1.1 nm
HOSEI MARU NO.3 Tanker1.2 nm
NIKKO MARU NO.28 Tanker1.4 nm
SAKIKAZE Tug1.6 nm
EIHO MARU NO.65 Tanker1.7 nm
GOYO MARU Tug1.7 nm
RYOEI MARU Tanker1.7 nm
DHT HARRIER Tanker1.7 nm

Where she is

Position	35.4962° N, 139.9052° E
Speed	8.4 knots
Course	85°
Local time

Voyage

From: Yokohama, JapanDeparted 22 Oct 2026 (inferred)
To: Not reported
ETA: Not reported