Callsign:	WDF4177
MMSI number:	367448870
Vessel class:	Passenger (60)
Location:	37°48.93' N 122°28.58' W - locator CM87ST25UR - show map 4.9 km South bearing 171° from Sausalito, Marin County, California, United States [?] 6.7 km Northwest bearing 312° from San Francisco, San Francisco County, California, United States 73.6 km Northwest bearing 316° from San Jose, Santa Clara County, California, United States
Last position:	2025-11-01 23:01:45 UTC (10d 3h16m ago) 2025-11-01 16:01:45 PDT local time at Sausalito, United States [?]
Course:	259° – heading 511°
Speed:	12 km/h
Last path:	WDF4177>ais via SUNSET
Positions stored:	97

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.