Doreen, I think the group you're looking for are the marine docents at UNH.

I'm not sure exactly how to contact the singers, but the director of the UNH marine docent program is mark.wiley@unh.edu.

See http://www.seagrant.unh.edu/seachanteysingers

None of them are a part of our shanty sing in Portsmouth, but some of us have performed at the same venue as they have.

Linn