The current state of affairs is noted at http://reviews.cnet.com/5208-7585-0.html?forumID=19&threadID=27667&messageID=311680
Some marinas are dropping WiFi hotspots, for the rest, cellphone interfaces may have to be used. Your cellphone company has to help you do this if they provide such.
I need some help figuring out how to get internet access while on our boat. I've researched some theories / mostly connecting wirelessly through certain marinas/ but - it won't help me while i'm out on the ocean visiting central/south america and so on. This is a live on vessel and I'll only need the internet to pay bills online - Any ideas on what to use to get a good connection?