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 K4MMJ-Y - show graphs
Comment: 0x27 via MMDVM
Location: 38°33.65' N 77°33.76' W - locator FM18FN24LO - show map
15.4 km South bearing 174° from Nokesville, Prince William County, Virginia, United States [?]
22.1 km South bearing 177° from Linton Hall, Prince William County, Virginia, United States
58.8 km Southwest bearing 231° from Washington, D. C., Washington, D.C., United States
115.4 km Southwest bearing 226° from Baltimore, City of Baltimore, Maryland, United States
Last position: 2025-09-20 14:14:48 UTC (16h33m ago)
2025-09-20 10:14:48 EDT local time at Nokesville, United States [?]
Device: unknown: D-Star APDPRS (D-Star)
Last path: K4MMJ-Y>APDPRS via C4FM*,qAR,K4MMJ-R (good)
Positions stored: 1
Other SSIDs: K4MMJ-9 K4MMJ-R K4MMJ K4MMJ-N K4MMJ-D
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