Thanks for answering. Looks like I need to apologize.
December 6, 2022, I sent an email to adtrgroup@aol.com.
Here is the text of the letter - "Good afternoon! please tell me (if possible) how are the additional rules for the Harpoon 3 edition that are described in the South Atlantic War Scenario Book (GDW 718) formulated? I have the latest edition of this book, but it was written for Harpoon 5. I like Rules book '87 better. Thank you."
They just didn't answer. Perhaps I did something wrong?
For additional rules. I read this post - https://harpgamer.com/harpforum/topic/3474-basic-game-play-and-purchase-advice/page/2/#comment-11657:~:text=South%20Atlantic%20War% 20II,found%20in%20High%20Tide. , and thought that in the old edition, perhaps there are rules that relate to landing operations (or I'm just mistaken). Even being, in a simplified form, this is very valuable information for me.
I think that the rules of Harpoon are formulated extremely accurately and concisely, and that part of them that is greatly simplified is a clearly defined goal for further development (for me).