Just a low monthly fee, but they will charge you each time you anchor with it. You'll be able to pay a premium for a loss insurance policy, otherwise you'll get stuck for the whole purchase price if you have a loss/damage before the contract is up.

But hey, you'll be able to get the next gen cheap when your contract is up.

Also, if someone anchors too close or you have a question about where to drop the hook -- you'll be able to call tech support (and they'll put you on hold with a recording telling you how important you are to them).