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 K6JM - show graphs
Comment: openSPOT4
Location: 37°49.83' N 121°56.04' W - locator CM97AT79WH - show map
5.9 km East bearing 80° from Danville, Contra Costa County, California, United States [?]
8.9 km East bearing 104° from Alamo, Contra Costa County, California, United States
43.1 km East bearing 82° from San Francisco, San Francisco County, California, United States
54.7 km North bearing 356° from San Jose, Santa Clara County, California, United States
Last position: 2025-04-18 16:01:18 UTC (22d 2h17m ago)
2025-04-18 09:01:18 PDT local time at Danville, United States [?]
Device: SharkRF: openSPOT4 (gadget)
Last path: K6JM>APOSB4 via WB5EKU,DSTAR*,qAS,WB5EKU (good)
Positions stored: 237
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