I do that too. I set cache to true and scroll around so the maps get pre-loaded in theory but it still seems the maps are slow. They appear to refresh as a ripple down the screen. It does seem that you need to have the phone connected when you fire it up so it can get a precision location. After that you can shut it down.I just hotspot to by Galaxy S8 and get the maps or if I know where I am going to fly I pre-cache them on the ipad at home.