In the periscope/UZO view, lock on your target and double click on the "Ship Type" on the notepad and the recog manual will automatically open up to the page with that ship on it.
Saves you having to thumb through all the pages.
This only works in auto targeting. In manual targeting, you have to thumb through the book and id the target. But once you id the target, same procedure applies.
Also, N is a shortcut key to open/close the manual if you're a keyboard user(like me

) and it stays on the last page you were looking at.