Station info - map view · info · telemetry · weather · raw · status · beacons · messages · bulletins · browse · moving · my account
Callsign, ship name or locator: Clear       
It is possible to search using wildcards (*?) after a prefix. Example: OH*
AIS vessel SENTINEL - show graphs
Callsign: 235024207
MMSI number: 235024207
Vessel class: Law enforcement (55)
Location: 51°53.97' N 1°18.72' E - locator JO01PV75KU - show map
6.5 km Northeast bearing 28° from Walton-on-the-Naze, Essex, England, United Kingdom [?]
8.1 km Northeast bearing 34° from Frinton-on-Sea, Essex, England, United Kingdom
105.8 km Northeast bearing 65° from City of London, Greater London, England, United Kingdom
108.1 km Northeast bearing 66° from London, Greater London, England, United Kingdom
Last position: 2025-07-18 12:12:39 UTC (8d 23h45m ago)
2025-07-18 13:12:39 BST local time at Walton-on-the-Naze, United Kingdom [?]
Course: 171° – heading 511°
Speed: 48 km/h
Dimensions: length 8 m width 3 m
Last path: 235024207>ais via G7OCD
Positions stored: 889
About this site
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.
User guide · FAQ · Blog · Discussion group · Linking to aprs.fi · AIS sites · Service status · Database statistics · Advertising on aprs.fi · Technical details · API · Change log · Planned changes · Credits and thanks · Terms Of Service · iPhone/iPad APRS