Callsign:	WDN4563
MMSI number:	368282130
Navigational status:	Undefined/default (15)
Vessel class:	Sailing (36)
Location:	37°51.65' N 122°21.48' W - locator CM87TU76BO - show map 8.8 km East bearing 99° from Tiburon, Marin County, California, United States [?] 9.4 km East bearing 98° from Belvedere, Marin County, California, United States 11.0 km Northeast bearing 29° from San Francisco, San Francisco County, California, United States 70.8 km Northwest bearing 325° from San Jose, Santa Clara County, California, United States
Last position:	2025-02-27 22:58:31 UTC (5d 20h43m ago) 2025-02-27 14:58:31 PST local time at Tiburon, United States [?]
Course:	88° – heading 511°
Speed:	10 km/h
Dimensions:	length 12 m width 4 m draught 0.0 m
Last path:	WDN4563>ais via SUNSET
Positions stored:	554

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.