Location:	51°32.94' N 7°18.89' E - locator JO31PN71SS - show map 168.9 m Southwest bearing 229° from Castrop-Rauxel, North Rhine-Westphalia, Germany [?] 10.0 km West bearing 291° from Dortmund, North Rhine-Westphalia, Germany 23.4 km Northeast bearing 62° from Essen, North Rhine-Westphalia, Germany 73.0 km North bearing 20° from Köln (Koeln), Regierungsbezirk Köln, North Rhine-Westphalia, Germany
Last position:	2025-07-11 12:24:03 UTC (18d 15h31m ago) 2025-07-11 14:24:03 CEST local time at Castrop-Rauxel, Germany [?]
Device:	Icom: IC-51 (D-Star)
Last path:	DO4SEM>API51 via DSTAR*,qAR,DB0BS-B
Positions stored:	3
Other SSIDs:	DO4SEM-R DO4SEM-N DO4SEM-B DO4SEM-D

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.