JOHN BYRON

Particulars

MMSI	740420000
Call sign	ZDLH4
Flag	Falkland Islands
Vessel type	Port tender
Length overall	12 m
Beam	4 m

From her own AIS broadcasts.

Her MMSI

740420000

The first three digits, 740, are the country code of the Falkland Islands: 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	5 m (A)
To the stern	7 m (B)
To the port side	3 m (C)
To the starboard side	1 m (D)
Heard from	AISStream
On the map since	1 Nov 2026, 12:27 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

PHAROS SG Cargo ship0.1 nm
ABEKO SERVER 3 Dredger0.1 nm
AFON ALAW0.1 nm
AUKENA Sailing vessel0.6 nm
OCEAN NOVA⁠has a photo Passenger ship0.6 nm
SIMON DE DANCER Sailing vessel0.6 nm
CUAN FISHER Sailing vessel0.7 nm
TECLA Sailing vessel1.2 nm

Where she is

Position	51.6927° S, 57.8215° W
Speed	Stopped, 0.0 knots
Local time

Voyage

From: Port Stanley, Falkland IslandsStopped here now
To: Not reported
ETA: Not reported