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 KO4RMS-9 - show graphs
Comment: 147.300MHzSpotter FX535
Mic-E message: Special
Location: 38°57.96' N 77°24.92' W - locator FM18HX01DU - show map
2.6 km West bearing 261° from Herndon, Fairfax County, Virginia, United States [?]
6.4 km West bearing 267° from Reston, Fairfax County, Virginia, United States
33.7 km West bearing 284° from Washington, D. C., Washington, D.C., United States
78.1 km Southwest bearing 243° from Baltimore, City of Baltimore, Maryland, United States
Last position: 2025-05-22 16:21:40 UTC (35d 22h1m ago)
2025-05-22 12:21:40 EDT local time at Herndon, United States [?]
Altitude: 109 m
Course: 103°
Speed: 20 km/h
Device: Kenwood: TM-D710 (rig)
Last path: KO4RMS-9>3X5W9V via N4CV-2*,WIDE1*,WIDE2-1,qAR,W4TTU-10 (good)
Positions stored: 5627
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