The only ferry I can think of is the mail boat that goes to each of the islands including George Town but it takes a looooong time. Maybe if u explained your situation in the forum, one of the cruisers going that way could be a help.
Sharon of Lead Free Too
I emailed some of my cruising friends and they suggest there are ferries to Eluthra and Andros Is. There maybe one that goes north to Grand Bahama but not sure.
Sharon