Callsign:	BLUE 4
MMSI number:	272896200
Navigational status:	Moored (5)
Vessel class:	Military operations (35)
Location:	50°48.43' N 1°06.66' W - locator IO90KT63QR - show map 1.7 km Northwest bearing 303° from Portsmouth, City of Portsmouth, England, United Kingdom [?] 1.8 km Northeast bearing 43° from Gosport, Hampshire, England, United Kingdom 103.9 km Southwest bearing 222° from London, Greater London, England, United Kingdom 105.8 km Southwest bearing 223° from City of London, Greater London, England, United Kingdom
Last position:	2025-11-20 05:24:09 UTC (4m40s ago) 2025-11-20 05:24:09 GMT local time at Portsmouth, United Kingdom [?]
Course:	357° – heading 92°
Speed:	0 km/h
Dimensions:	length 52 m width 9 m draught 0.0 m
Last path:	BLUE 4>ais via G7RUH
Positions stored:	118

This page shows real-time information collected from the Automatic Position Reporting System Internet network (APRS-IS). APRS is used by amateur (ham) radio operators to transmit real-time position information, weather data, telemetry and messages over the radio. A vehicle equipped with a GPS receiver, a VHF transmitter or HF transceiver and a small computer device called a tracker transmits it's location, speed and course in a small data packet, which is then received by a nearby iGate receiving site which forwards the packet on the Internet. Systems connected to the Internet can send information on the APRS-IS without a radio transmitter, or collect and display information transmitted anywhere in the world.