One can put vector data for maps on the phone being online.
And offline your programm generates maps from that vector data.
So it’s an offline vector map generator.
More programs like Osmand, Navfree and VGPS on Android use offline vector data to generate their maps.
I suppose that about how they do it is like PocketEarth does it.
If you speak about an offline vector map generator I know where you are talking about. If you speak about realtime you confuse me.
Realtime OSM maps would be as actual as those on http://www.openstreetmap.org/
For the rest: this looks like a great App.
