Be wary of any internet
based AIS applications are only as good as the recieving stations in the area(if any) and the data connection you have. The receiving station in Portland
goes down occasionally. The internet based applications show no AIS signals in Portland
Harbor where my onboard system does.
True AIS is a boat to boat communication protocol. It can only be transmitted through the internet if there is an active receiving station receiving AIS signals via VHF
and sending the data to the internet. These stations cannot be solely relied upon for navigation