The unique offline subway map is geographically scaled to online maps so your location can be shown along with the nearby subway stations (in red solid dots) and bus stops (in white dots)
The subway diagram help you find information about each and the nearest subway stations and routes by color.
The tour guide & searchable points of attractions tell you all the fun things to do and places on the offline maps.
The points of attractions can be searched by key word of category then plotted with loaded information such as visit duration, ranking, etc.
As a former Beijing resident, I knw how frustrated it is when you found out the subway station is in another direction after walked blocks of street.
You can do more such as viewing friends current locations, collecting your locations into named trails and sharing with friends, note keeping, timer, etc.