Get the most from indoor positioning with the Situm Mapping tool. This is an indoor calibration, navigation, and positioning tool.
If you want to know about the calibration procedure, they have a quick user guide as well that will help you understand everything about it. You can navigate in the already calibrated buildings and set up routes to your point of interest. There are already uploaded points of interest and maps in this app, you can easily visualize them too. This app also lets you calibrate their building, enabling indoor positioning.