Good grief, this reminds me of a book a poster was looking for a while back… “Ship Handling in Narrow Channels” by Carlyle Plummer. Still can’t find it, effing Amazon wants $750 for a copy. When clearing out one of my rentals left my copy for a fishing charter captain. What a mistake. Would loved to have passed it down at no charge other than shipping costs… Acquired it in early 70’s. Ears still open, most of my pals that attended the class that required that book are gone.