Yep it uses a selection of the most important data from OSM because the entire thing would be too huge to keep on your phone. You download the map in sections so region/city based but you can also just get an entire country which will be a few GB.
It can import/export bookmarks and record and import gpx tracks. Has TTS support and you can even edit things (like opening hours and stuff) if you have an OSM account.
A little confused, is this basically the same thing as Open Street Maps, just in app form?
Yep it uses a selection of the most important data from OSM because the entire thing would be too huge to keep on your phone. You download the map in sections so region/city based but you can also just get an entire country which will be a few GB.
It can import/export bookmarks and record and import gpx tracks. Has TTS support and you can even edit things (like opening hours and stuff) if you have an OSM account.
They use OSM as source for maps, yes.
Not sure how much they add, aside from offline functionality.
Other apps add extra data sources.