This subsystem allows system users to integrate digital terrain data and enables the graphical visualization of GIS data as it relates to the Radio Station Licensing, Technical Analysis, Spectrum Surveillance, and Coordination / Notification subsystems of AFMS. The GIS subsystem performs three (3) main support functions: data entry, EMC calculation, and visualization.

GIS supports the radio station license application, coordination and notification data entry process by automatically deriving radio station attributes based on the location (coordinates) of the radio station. Examples of location-based attributes include, radio climatic zone, rain climatic zone, etc. EMC calculations consider digital terrain models, such as the terrain intrusion in the signal path. Finally, GIS provides a visualization capability that includes the ability to situate radio stations against a map background, compare terrain profiles between two radio stations, and view coverage and antenna radiation patterns.