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*
APRS station K4TNX-9 - show graphs
Comment: ART_SUN PRAIRIE
Mic-E message: En route
Location: 43°07.78' N 89°18.36' W - locator EN53ID31GC - show map
6.1 km East bearing 78° from Maple Bluff, Dane County, Wisconsin, United States [?]
7.8 km North bearing 17° from Monona, Dane County, Wisconsin, United States
10.0 km Northeast bearing 51° from Madison, Dane County, Wisconsin, United States
114.0 km West bearing 276° from Milwaukee, Milwaukee County, Wisconsin, United States
Last position: 2025-10-21 15:54:18 UTC (41d 1h43m ago)
2025-10-21 10:54:18 CDT local time at Maple Bluff, United States [?]
Altitude: 262 m
Course: 226°
Speed: 67 km/h
Device: Yaesu: FTM-300D (rig)
Last path: K4TNX-9>TS0W7X via qAR,KB9TEN
Positions stored: 5930
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