| tpk | ArcGIS Tile Data Package |
| tpo | Topo Explorer Map |
| tqm | Traqmate Data File |
| trip | Garmin Nuvi Trip Data |
| trk | CompeGPS Land Track Data |
| trk | Fugawi Tracklog Data |
| trk | Holux MapShow Track Data |
| trk | SeeYou Track Data |
| trl | Alan MAP 500 Tracklog |
| tro | Visual Topo Document |
| tsd | TNTmips TileSet Definition Data |
| ttbin | TomTom Adventurer Route Data |
| ttkgp | TatukGIS Project |
| ttmd | Trail Tracker GPS Map Data |
| twl | Naviguide Binary GPS Track Data |
| twz | TerraGo Collaboration Package |
| tzd | TimeZero Exchange Data |
| ubx | UBX GPS Log Data |
| uko | UKOOA P1/90 Data |
| ulf | Universal List File |
| upi | Sygic Drive POI Database |
| vct | Idrisi Vector Image |
| vdc | Idrisi Vector Documentation |
| vec | ENVI Vector Template |
| vec | Idrisi Vector |
| ver | SeeYou Airspace Data |
| vfk | Czech Cadastral Exchange Data Format Data |
| vmap | CompeGPS Vectorial Map |
| vpf | Vector Product Format Data |
| vrt | GDAL Virtual Format |
