For reading this 21 book series it's worth investing into one more book with background information. I can recommend Patrick O'Brian's Navy: The Illustrated C

For reading this 21 book series it's worth investing into one more book with background information. I can recommend Patrick O'Brian's Navy: The Illustrated Companion to Jack Aubrey's World (Hardcover) Lots of valuable information, lots of illustrations and schematics and photos. https://www.goodreads.com/en/book/show/24519 https://www.goodreads.com/en/book/show/24519