Callsign:	WDP3581
MMSI number:	368346760
Navigational status:	Under way (engine) (0)
Vessel class:	Tug (52)
Destination:	CATHLAMET (ETA Aug26 00:00)
Location:	37°50.55' N 122°27.83' W - locator CM87SU42IE - show map 3.4 km South bearing 179° from Belvedere, Marin County, California, United States [?] 3.5 km South bearing 190° from Tiburon, Marin County, California, United States 8.5 km Northwest bearing 333° from San Francisco, San Francisco County, California, United States 75.1 km Northwest bearing 318° from San Jose, Santa Clara County, California, United States
Last position:	2025-06-25 10:46:53 UTC (31d 1m ago) 2025-06-25 03:46:53 PDT local time at Belvedere, United States [?]
Course:	13° – heading 20°
Speed:	14 km/h
Dimensions:	length 20 m width 10 m draught 0.0 m
Last path:	WDP3581>ais via SUNSET
Positions stored:	52

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.