The article covers geographic information systems (GIS) implementation in radio frequency electromagnetic fields (RF EMF) monitoring within indoor and near building areas. GIS functions are described, which provided development of the new prompt method of indoor RF EMF monitoring, which is based upon in-motion measurements along predetermined network of tracks created using geometrically correct geo-referenced building’s spatial model. The workshop describes the methods of geographic information systems usage for high frequency measurements geographic referencing in Global Navigation Satellite Systems (GNSS) denied areas, for 2D and 3D experimental data visualization and for spatial boundaries location assessment for zones with certain radio signal strength around transmitter using spatially irregular experimental data sets and different geometrical approaches. Experimental approbation of the introduced GIS-based method demonstrated high efficiency of detection and localization of non-linear RF EMF variations from indoor and remote transmitters inside and around building within 80…1500 MHz frequency range.