Hi Bruce,
Did you know they'd be there or did you just stumble onto them? I'd love to make time to see them next time I'm headed from Maine to the Cape Cod Canal but not sure if it's something that can be reliably known ahead of time, ie when and where they're likely to be.
In any event, very nice videos!
Give a shout if your cruise takes you near Orr's Island (Casco Bay)
Max