No, you do not. Licenses haven’t been required for metal detector use since about 1980 (est.), but depending on the area that you visit, you may need a permit. In most cases, highly populated beaches and tourist trap areas require a permit. It’s not only a way for them to make a little extra money, but it’s a way to privatize treasure hunting so there isn’t as much competition. While permit costs don’t have to be too high, it still helps you by facing less competition. To find out if you need a permit or to file one, visit the local municipality government website for the area you’re interested in treasure hunting at.