Files with the UPOI extension are related to the GPS satellite navigation software installed in portable devices manufactured by NNG Kft. This software is Nav N Go iGO. UPOI files are used to store POI (Point of Interest) data. These can be different places on the map (shop, gas station, tourist facility or any other place defined in the file). Each of the POI files must contain information about the longitude and latitude of a specific place.

In addition to PDAs, Nav N Go iGO can also work on smartphones with the Windows Mobile operating system.