I only see a bit of this thread - I came in late.

Is what you want is internet connections from your laptop from your
boat while cuising?

I think you are saying you have a Mac. If that is the case then you
should use a phone to connect. I use my powerbook and a cell phone to
connect at 144kbs and the cost is $4.95 a month. If that works for you
and you have a mac, let me know and I will let you know what you need
to do the job.