PERSEUS

Particulars

MMSI	431015804
Call sign	JD4851
Flag	Japan
Vessel type	Tanker
Length overall	53 m
Beam	9 m
Draught	3.8 m

From her own AIS broadcasts.

Her MMSI

431015804

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 AWorked out, not reported: only Class A transponders send a status, and she sends one. Class A is the full-strength kind that large cargo and passenger ships must carry.
Status she reports	Under way under engine power
To the bow	42 m (A)
To the stern	11 m (B)
To the port side	2 m (C)
To the starboard side	7 m (D)
Destination as typed	JP HIM OFF/S2What the crew entered; the Voyage card turns it into a port.
Heard from	AISStream
On the map since	31 Oct 2026, 01:58 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

DAIKOU MARU Tug1.6 nm
KURUSHIMA Passenger ship4.4 nm
ULTRA BEIRA Cargo ship4.6 nm
HOKUSEI MARU Cargo ship4.9 nm
YAHATA_MARU Cargo ship5.0 nm
NO.11 ASAHIMARU Cargo ship5.1 nm
KAISEIMARU Cargo ship5.3 nm
WAKAYOSHI MARU NO.10 Tanker5.4 nm

Where she is

Position	34.1899° N, 133.0012° E
Speed	11.9 knots
Course	72°
Local time

Voyage

To: Himeji, JapanAbout 90 nm away in a straight line
ETA: 31 Oct 11:00 UTC