Yes. The WGS 84 locations of the BLE beacons provided by Bluetooth Beacon Tracker are based on a geo-referencing of the BLE nodes that is done using the a floor plan image uploaded inside the Indoor Tracking dashboard on top of a Google Map view. So the reference system is Google Maps. However you are free to use any other reference system and you have just to make sure that the floor plan image uploaded inside your reference system has the same size, scale and alignment with the floor plan image that you have uploaded inside the the Indoor Tracking dashboard.