Location:	38°52.85' N 77°23.04' W - locator FM18HV31WJ - show map 1.7 km Northeast bearing 61° from Greenbriar, Fairfax County, Virginia, United States [?] 7.2 km West bearing 270° from Oakton, Fairfax County, Virginia, United States 30.1 km West bearing 267° from Washington, D. C., Washington, D.C., United States 80.6 km Southwest bearing 236° from Baltimore, City of Baltimore, Maryland, United States
Last position:	2025-05-15 12:21:30 UTC (57d 2h43m ago) 2025-05-15 08:21:30 EDT local time at Greenbriar, United States [?]
Altitude:	130 m
Course:	291°
Speed:	2 km/h
Device:	Icom: IC-5100 (D-Star)
Last path:	W4GRZ-12>API510 via DSTAR*,qAR,NV4FM-C
Positions stored:	31
Other SSIDs:	W4GRZ-7 W4GRZ-9 W4GRZ-10

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.