and meant to write that in my area (Western long Island Sound) the reporting land stations don't show class b vessels at marinetraffic.com -- so some filtering is going on somewhere (in this case the shore stations?) Also -- class B vessels only have a range of about 10-15 miles (class A perhaps 10 miles more) and shore stations are often spaced wider than that so there are gaps of coverage and that's why I wouldn't rely on it or http://www.marinetraffic.com

Is this AIS project your current business interest Ronald?