Nokia is hot on the trail of Google (IMO) in indoor mapping of buildings. As you may know, Google has updated its Android Google Maps with version 6.0 that adds indoor Maps. Now, Nokia is showing off its version that uses Bluetooth 4.0 and WiFi for indoor navigation.
Based on the video, it incorporate a device inside the premises and also WiFi signal to locate the position. It also has features like bag location alert and etc. Check out this video.
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(source)