Our captains locally (NJ) do not want you locking in GPS coordinates when on their boat. They view it as that is their business/income, they put the time and effort in to find/get to the wreck and that is it. Information is out there, it is up to you to put the time in, find the coordinates, get in your boat and actually find and tie into the wreck/site. Some of the sites we dive are well known (we get there and tied in quickly) others aren't so to hit those uncommon or virgin wrecks is great and that's why I pay to go on the boat.