How did you ever find this book and its reviews on Amazon?
So, it’s a serious boating book?
I probably found it a few years ago, while reading an article about funny Amazon reviews.
Yes! Captain Trimmer was a Master Mariner and a harbor pilot. The book was sincere; apparently the Captain had seen many pleasure-boaters doing stupid things out there and failing to understand the physics involved in encounters with Huge Ships:
https://en.wikipedia.org/wiki/How_to_Avoid_Huge_Ships