Billybudd... most of the east coast is actually covered by the Mel Fisher leases. And, essentially, the rest of Florida is covered under their goofy antiques law. your best bet for info is to go over to the shipwrecks forum and ask seahunter. He actually has the fisher leases for a portion of the Sebastian inlet. I don't know for sure, but he might even bring you aboard... most of the guys there are pretty great, and will help you with anything.
just remember, most of their "take" is still covered under the leases and florida law, so if you did find something, you'll probably only get a portion of the find (i think florida takes around 20% and the fishers another 30% - not sure on that). talk to seahunter - if anything, i'm sure he can point you in the right direction.
steve