Comment:	K4MHD Base
Location:	38°51.22' N 77°21.05' W - locator FM18HU74VV - show map 4.9 km Southeast bearing 117° from Greenbriar, Fairfax County, Virginia, United States [?] 6.9 km East bearing 78° from Centreville, Fairfax County, Virginia, United States 27.6 km West bearing 260° from Washington, D. C., Washington, D.C., United States 80.1 km Southwest bearing 233° from Baltimore, City of Baltimore, Maryland, United States
Last position:	2026-01-28 21:58:47 UTC (4d 6h4m ago) 2026-01-28 16:58:47 EST local time at Greenbriar, United States [?]
Altitude:	0 m
Device:	Anytone: AT-D578 (rig)
Last path:	K4MHD>APAT51 via W4VA-13*,WIDE1*,WIDE2-1,qAR,KG4GIY
Positions stored:	1

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.