There is also a similar site for marine traffic: http://www.marinetraffic.com/ais/ http://www.marinetraffic.com/ais/ The technology behind the system is the sa

There is also a similar site for marine traffic: http://www.marinetraffic.com/ais/ http://www.marinetraffic.com/ais/ The technology behind the system is the same as in FlightRadar (on principle). The ships have AIS[1] transponders which transmit the position and velocity. This information is received through receivers run by army of volunteers and then submitted to the central site. [1] http://en.wikipedia.org/wiki/Automatic_Identification_System http://en.wikipedia.org/wiki/Automatic_Identification_System