Problem statement: passing of some object in the building of person with iOS device must receive a signal about it. A program that monitors the region can be switched off.
The problem is that GPS does not provide sufficient accuracy to track moving devices in the building. This AIDS the accuracy of determining the coordinates of the integrated gps receiver, and the interference on the inside of the building (other radio devices, metal constructions). It is possible to solve problems with the help of iBeacon, but Bluetooth is usually turned off, therefore the person can not get a signal.