Station info - map view · info · telemetry · weather · raw · status · beacons · messages · bulletins · browse · moving · my account
Callsign, ship name or locator: Clear       
It is possible to search using wildcards (*?) after a prefix. Example: OH*
AIS vessel DEFIANCE - show graphs
Callsign: WDM8263
MMSI number: 368241730
Navigational status: Under way (engine) (0)
Vessel class: Sailing (36)
Location: 42°21.82' N 71°01.92' W - locator FN42LI67DG - show map
1.5 miles East bearing 76° from Boston, Suffolk County, Massachusetts, United States [?]
2.3 miles Northeast bearing 23° from South Boston, Suffolk County, Massachusetts, United States
3.8 miles Southeast bearing 116° from Somerville, Middlesex County, Massachusetts, United States
3.8 miles East bearing 102° from Cambridge, Middlesex County, Massachusetts, United States
Last position: 2024-10-29 13:40:05 EDT (55d 10h1m ago)
2024-10-29 13:40:05 EDT local time at Boston, United States [?]
Course: 0° – heading 511°
Speed: 0 MPH
Dimensions: length 12 m width 4 m draught 0.0 m
Last path: WDM8263>ais via kx1t
Positions stored: 2829
Stations near current position of DEFIANCE - show more
callsign distance last heard - EST      callsign distance last heard - EST
SMR MAVERICK75.0 yards 147°2024-12-23 22:41:27 KEEWAYDIN76.3 yards 72°2024-12-13 14:38:45
BOSTON PILOT CHELSEA112.7 yards 158°2024-12-23 16:39:27 SHIPS N GIGGLES135.6 yards 226°2024-12-03 13:51:25
SEATOW RESCUE 1142.9 yards 214°2024-12-06 12:55:51 RETRIEVER152.2 yards 211°2024-12-18 15:09:30
SOSSEGO173.9 yards 217°2024-11-24 08:44:47 EASTERN POINT208.4 yards 184°2024-12-09 11:34:02
SILVER CHARM236.2 yards 232°2024-12-18 13:09:00 GRATITUDE293.8 yards 226°2024-12-03 10:08:43
KYLEX301.5 yards 290°2024-12-08 11:57:00 SERENITY309.8 yards 234°2024-12-11 17:47:55
PATTY ANN344.7 yards 191°2024-12-21 11:04:19 RACHEL J418.3 yards 235°2024-12-01 09:37:54
CALEDONIA425.4 yards 238°2024-12-11 10:47:53 AMERICAN UNITED507.1 yards 109°2024-12-23 22:38:55
EFD MARINE 1510.1 yards 106°2024-12-20 14:13:30 GENESIS VISION0.4 miles 190°2024-12-23 22:40:56
ENCORE V0.6 miles 235°2024-12-22 21:19:14 EASTERN RESPONDER0.7 miles 173°2024-12-23 16:55:42
About this site
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.
User guide · FAQ · Blog · Discussion group · Linking to aprs.fi · AIS sites · Service status · Database statistics · Advertising on aprs.fi · Technical details · API · Change log · Planned changes · Credits and thanks · Terms Of Service · iPhone/iPad APRS