“Trumpet - Never heard of it in days of sail or steam.”

Natural or baroque trumpet calls - bugle calls, same-same.

U.S. Marine Corps Buglers: U.S. Army Bugle Calls - U.S. Navy Bugle Calls, Emerson Records 7177, 7", 78rpm, 1916.
U.S. Navy Bugle Calls (1964) Part I
Royal Navy and Royal Marines Bugle Calls Part 1


"...You do not teach people to stamp about on any vessel with either wooden or steel decks."

It's called stepping. The working shanty is a dance form.