Well I''ve seen WiFi at marina''s. they are starting to hook em up at Marina''s around here. My Marina has it and it works good.
You can go from Marina to marina around LI Sound and if its the same system you only pay a monthly fee. They are hooking up more and more marinas.
I''s called Beacon Wifi http://www.beaconwifi.com
Just wait...AT&T and other carriers are going to start offering it . Verizon already has it all over NY City and its free to their DSL customers