I looked at the Seaport online catalog and found no reference for
this film. Do you have any further details?

here is an overview of the whaler Charles W. Morgan from their catalog:

The Charles W. Morgan is the last surviving wooden whaling ship from the great days of sail. Built in 1841 in New Bedford, Mass., the Morgan had a successful 80-year whaling career. She made 37 voyages before retiring in 1921, and was preserved as an exhibit through the efforts of a number of dedicated citizens. After being on display in South Dartmouth, Mass., until 1941, she came to Mystic Seaport, where each year thousands of visitors walk her decks and hear the fascinating story of her career as a whaling vessel, historic exhibit, film and media star, and a porthole into America's rich history.