Callsign:	WDK4147
MMSI number:	367085890
Navigational status:	Under way (engine) (0)
Vessel class:	Tug (52)
Location:	37°51.52' N 122°23.41' W - locator CM87TU36EB - show map 6.1 km East bearing 106° from Tiburon, Marin County, California, United States [?] 6.7 km East bearing 103° from Belvedere, Marin County, California, United States 9.7 km North bearing 15° from San Francisco, San Francisco County, California, United States 72.3 km Northwest bearing 323° from San Jose, Santa Clara County, California, United States
Last position:	2025-02-27 16:20:18 UTC (6d 9h6m ago) 2025-02-27 08:20:18 PST local time at Tiburon, United States [?]
Course:	329° – heading 511°
Speed:	7 km/h
Last path:	WDK4147>ais via SUNSET
Positions stored:	1073

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.