It is nice,it is easy and it is offline! What more do you need!?
OsmAnd Maps & Navigation lets you download maps from their database( you can download them from the app’s setting) and you can use them later when you don’t have access to internet.
OsmAnd Maps & Navigation is simple. Like most similar apps, it shows your location on the map and lets you find addresses and directions to places. If you go hiking, mountain climbing or you are not always connected to internet for any reason, this is going to help you a lot.
One thing you probably already know is that in order to pinpoint your location on a map and other navigation related functions you either need internet or better, you need GPS.