Callsign:	WDQ4237
MMSI number:	368423740
Navigational status:	Under way (engine) (0)
Vessel class:	Port tender (53)
Location:	37°46.85' N 122°22.78' W - locator CM87TS47KJ - show map 3.6 km East bearing 79° from San Francisco, San Francisco County, California, United States [?] 9.9 km West bearing 255° from Oakland, Alameda County, California, United States 65.0 km Northwest bearing 319° from San Jose, Santa Clara County, California, United States
Last position:	2026-02-18 17:31:13 UTC (6d 22h36m ago) 2026-02-18 09:31:13 PST local time at San Francisco, United States [?]
Course:	107° – heading 511°
Speed:	3 km/h
Dimensions:	draught 0.0 m
Last path:	WDQ4237>ais via AA6CE
Positions stored:	415

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.