BookMark Keeper is the program which allows you

to create "bookmarks" while reading the document with Adobe Acrobat Reader.At creation of a

bookmark will be saved not only text position but also zoom level and page layout.

That it means in practice - you get the possibility to access quickly to certain views in the text and in each of them can be in its own magnification and page layout.This is very conveniently by operation with a various sorts of documents especially with circuits, schemes and datasheets.