The paper explores indoor location algorithms and implements a fingerprinting system using RSSI that achieves an average error of 0.43m.
The authors’ ‘fuzzy logic type-2’ system allows for complex environments such as buildings with glass/metal corridors. They comment that fingerprinting requires pre-configuration which is one of the main disadvantages of this method.
BlindSquare is a popular accessible GPS application developed for the blind and visually impaired. It describes the environment, announces points of interest and street intersections. BlindSquare also works with iBeacons.
An example of use of BlindSquare with beacons is Melbourne Zoo that allows people with visual impairments to get to parts of the zoo that are out of bounds to guide dogs.