This is an Android  based  app for navigating indoor spaces. This is currently a research project at Microsoft and interested people can try out this app and provide their feedback to Microsoft. This navigation approach does not use beacons, so it is not limited by physical infrastructure deployment.
 
For more details please refer to the following link.
 
https://www.microsoft.com/en-us/research/blog/path-guide-new-approach-indoor-navigation/