Yes, this book is packed with useful information for the U-boat addict. I consider it 'THE' reference for the full history of German U-boats, spanning from the early beginnings - WWI - to the full details of all types in WWII. One minor detail is that the layouts depicted in the book are scaled quite small - typically spread across just one page and a half. I've seen the German original and those layouts are folded and scaled much larger, so contain much more detail. But on the whole, one of the best reference books I've seen. Just look at the movie 'Hitler's lost sub'; those 'shadow' divers also use this book for their lookup work.