Any bone head with a credit/debit card and an internet connection can get a boating certificate from another State (i.e. Florida) and cheat through the entire test! A bunch of people from my office wanted to use some jet ski's my boss owns. They went online and got safety certificates from Florida and Delaware in about an hour. Hence they'd have no clue what "NWZ" meant. These certificates entitle them to operate boats and jet skis and New Hampshire will honor them.
I really think there needs to be stricter education guidelines for operating on the lake.