Forum Moderator / Recognized Developer / XDA Portal Team
Join Date:Joined: Aug 2012
The OP used a poor choice of words, he just means "modified" considering he's talking about the Google Maps (Navigation) app (it's free) and judging by his question (how to use it offline).
You can save the area you want for offline use. Just zoom in to it, and type "ok maps" in the search bar, then hit enter.