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*
Web station W9TJP-4 - show graphs
Comment: aprs.fi for iOS
Location: 43°08.93' N 87°59.01' W - locator EN63AD15XR - show map
2.2 km Southwest bearing 224° from Brown Deer, Milwaukee County, Wisconsin, United States [?]
5.6 km Southwest bearing 240° from River Hills, Milwaukee County, Wisconsin, United States
13.7 km Northwest bearing 333° from Milwaukee, Milwaukee County, Wisconsin, United States
115.3 km East bearing 85° from Madison, Dane County, Wisconsin, United States
Last position: 2025-06-17 16:31:20 UTC (12h34m ago)
2025-06-17 11:31:20 CDT local time at Brown Deer, United States [?]
Course: 177°
Speed: 3 km/h
Last path: W9TJP-4>aprs.fi via aprsfi-iOS
Positions stored: 28761
Other SSIDs: W9TJP-7 W9TJP W9TJP-9 W9TJP-Y
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