I had a Whites underwater dectector. One thing I found out that a lot of places they are illegal, National , State, local parks are off limits. In Florida you can use them on public beaches, once you go in the water that is a different story, you are going to love this....Fl. has leases on the bottom of the ocean, $1K per plot and are fiercely guarded, they even hire spotters that sit on the beach and watch with binoculars for claim jumpers. I sold mine for lack of places to use it. If you buy one make sure to check the regulations of where they are allowed to be used. What is so ironic the leases are public info, you can look up the info on the net, name and even the lon and lat of their claim ,hence telling everyone where the wreck is. Most of the leases are held by Treasure Salvors Inc. Mel Fishers company