The new MarineTraffic Internet AIS service, cautiously optimistic
These days I feel obliged to include a warning every time I write about AIS over the Internet. What you see in a nice app like ShipFinder HD (above) probably does not include every vessel that’s transmitting AIS info even in fairly well covered areas like the Miami/Lauderdale area, and many areas aren’t covered at all…unless perhaps you’re using the Seapilot app in Sweden or somehow have access to another well-organized AIS receiver system. That’s because what most of us see on computers, phones or tablets connected to the Web is target data collected by patchy networks of volunteers whose shore antennas may well miss even fairly nearby 2 Watt Class B AIS transmissions or even 12 Watt Class A signals obscured by buildings or terrain (or may suddenly go offline just because the volunteer’s kid trips on a power cord or similar).