Hey Roger
It takes 21 days to form/break a habbit
Use this opportunity to "get back to nature", "become the salty dog we all know you to be"...... all kinds of stuff I could quote.
I know you say that you "need" the internet to get better weather reports and such but just consider our fore fathers, they came here on a compass and a prayer reading the weather from the, well weather deck, reading the waves to tell of land over the horizon (reflected waves?), quite a few did it with out even paper maps.
You can do it, I know you can. I'd recommend you not go cold-turky so just stop using everything but SBO, communicate with your friends and ween yourself off the other stuff.
The first step to a cure is admitting you have a problem and I think you just did that. Now just take the next step.
Inch by inch, its a sinch, mile by mile it is a trial. Just don't do it today and let tomorrow worry about itself.