I installed a GME AISR120 AIS
receiver this year and find it works very well. In fact, it seems to work impossibly well! At the moment, anchored at Magnetic Island near Townsville (Queensland, Australia) my AIS
is showing ships up to 1000nm away (in Noumea). Obviously I am not receiving VHF radio
signals over such a large distance, so there must be another explanation for receiving this information.
As my Macbook Pro was not connected to the internet
at the time, these signals could only be received over VHF
so I assume there must be some type of repeater that "relays" AIS packets over long distances, possibly receiving packets via satellite
? Does anyone know what's going on here? I've look at Wikipedia and Googled "AIS range" but I can't seem to find any info. If someone knows whats happening here, I would really appreciate an explanation.
A screenshot is attached showing my OpenCPN screen
Thanks in advance!