Do you think NH will care if my certificate is from Maryland? BoatUS foundation offers a free online course and MD certificate. I'll gladly take the 6 hour class as a refresher. A lot of my boating is done in Maryland anyhow, as I'm about 20 miles from the PA/MD border.
Here is the link for anyone who stumbles upon this thread: it's good for 20+ states. Except NH. And mine. Go figure.
https://www.boatus.org/free/