It is an Android app that decodes AIS messages transmitted by vessels , ships, over radio using a cheap USB DVB-T / RTL-SDR stick.
AIS messages are transmitted over VHF. Channel A: 161.975 MHz Channel B: 162.025 MHz. The app decodes both channels simultaneously. This app needs no internet connection, it decodes the real time received messages. This is a truly standalone full featured AIS receiver.
The received messages will be translated into NMEA0183 strings which can be forwarded then via UDP or TCP streaming to third-party apps, PC programs or other devices. Such Apps can display the received AIS data for example on a map along with information about the received objects.
Please note: The app needs additional (very cheap) hardware to receive the radio signals.
I live by the river. Especially in summer time sitting at the terrace and seeing all this nice river cruise ships travelling by, it comes to my mind, that it could be interesting to know a little bit more about these ships. At this time I knew about the possibility of tracking live airplane positions, but for ships? Soon I also found some similar pages in the internet, where you can watch vessel positions – but my region wasn’t covered. So i investigated a little bit more time and I found the amazing blog http://www.rtl-sdr.com/. The blog is absolute fantastic; showing several different applications what can be done with a so called RTL-SDR dongle. So in august 2015 I created a first Android app for decoding AIS ship positions.
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