Ok listen to me. This function works and I know it just because I tried! Last month I left my house and I went to another city where I had an internet connection only in few places. However I didn't need. This because when the first time I connected to Internet I opened the App maps. Then I went to my position using localization. I zoomed into the map and searched for the places I wanted to visit. Done. I didn't need to be connected anymore because when I was offline and I opened map, the iPhone was still able to track my position and I could see the blue point moving as it does when connected to Internet. The only thing that doesn't work is the search function and turn by turn direction. Tell me if you need to know something else !