Callsign:	WDB9821
MMSI number:	366983440
IMO number:	973033
Navigational status:	Under way (engine) (0)
Vessel class:	Tug (52)
Destination:	MARYSVILLE (ETA Sep08 23:00)
Location:	44°30.96' N 82°50.61' W - locator EN84NM83SU - show map 39.0 km Southeast bearing 113° from Harrisville, Alcona County, Michigan, United States [?] 40.5 km East bearing 73° from Au Sable, Iosco County, Michigan, United States 132.1 km Northeast bearing 39° from Bay City, Bay County, Michigan, United States 150.2 km Northeast bearing 48° from Midland, Midland County, Michigan, United States
Last position:	2025-09-12 01:10:27 UTC (4d 6h40m ago) 2025-09-11 21:10:27 EDT local time at Harrisville, United States [?]
Course:	341° – heading 341°
Speed:	23 km/h
Dimensions:	length 257 m width 23 m draught 8.3 m
Last path:	WDB9821>ais via AIS-CK
Positions stored:	161710

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.