- Guides users by tracing back their steps
- Features advanced algorithms using sensors on smart phones and tablets
- Complements pedestrian navigation
The obstacle to creating useful indoor navigation applications is a lack of accurate indoor maps. Early indoor maps lack details such as indoor pathways and points of interests. They are also not always maintained to ensure they are up to date. Many maps cannot adequately represent data on different floors in a multi-storey structure.
However, the lack of maps is not a significant obstacle for guiding a pedestrian to retrace his steps. For example, shoppers rushing into a mall without noting where they left their cars can be guided back along the path they had taken.