Callsign:	PB4 (
MMSI number:	244690529
IMO number:	124794
Navigational status:	Undefined/default (15)
Vessel class:	(0)
Location:	52°06.92' N 4°26.92' E - locator JO22FC37UQ - show map 7.1 km Northwest bearing 335° from Zoetermeer, Gemeente Zoetermeer, South Holland, Netherlands [?] 7.8 km Northwest bearing 303° from Benthuizen, Gemeente Rijnwoude, South Holland, Netherlands 21.5 km North bearing 354° from Rotterdam, Gemeente Rotterdam, South Holland, Netherlands 41.6 km Southwest bearing 226° from Amsterdam, Gemeente Amsterdam, North Holland, Netherlands
Last position:	2025-10-10 08:57:39 UTC (5d 9h53m ago) 2025-10-10 10:57:39 CEST local time at Zoetermeer, Netherlands [?]
Course:	34° – heading 511°
Speed:	10 km/h
Dimensions:	length 50 m width 7 m draught 0.0 m
Last path:	PB4 (>ais via Southwood
Positions stored:	6061

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.