Callsign:	WDN4540
MMSI number:	368281910
Navigational status:	Undefined/default (15)
Vessel class:	Sailing (36)
Location:	37°49.08' N 122°30.81' W - locator CM87RT86IH - show map 7.0 km South bearing 163° from Tamalpais-Homestead Valley, Marin County, California, United States [?] 9.6 km Northwest bearing 300° from San Francisco, San Francisco County, California, United States 10.2 km South bearing 164° from Mill Valley, Marin County, California, United States 76.1 km Northwest bearing 315° from San Jose, Santa Clara County, California, United States
Last position:	2025-10-10 02:05:58 UTC (13d 7h43m ago) 2025-10-09 19:05:58 PDT local time at Tamalpais-Homestead Valley, United States [?]
Course:	62° – heading 73°
Speed:	9 km/h
Dimensions:	length 16 m width 4 m draught 0.0 m
Last path:	WDN4540>ais via SUNSET
Positions stored:	155

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.