Quote:
Originally Posted by PapaKilo
Well known site already, but thanks for sharing  Side effects - It does not cover all the areas of the globe, especially any near to Somali  |
All positional data, speeds and so on come from the ships' own AIS transponders, which operate on a VHF frequency that I can't remember right now. That basically limits the system's range to line of sight, which can be anything from a few kilometers up to 60-100km. Coastal station that receive the AIS transmissions and forward them to be published on the internet don't exist everywhere either.
I'd also imagine skippers are pretty keen to turn AIS off altogther in high-threat areas
