| extension name | file type | Classification |
|---|---|---|
| NGT | Noni GPSPlot Track File | GIS file |
| NM2 | Navitel Map File | GIS file |
| NM3 | Navitel 5 Map File | GIS file |
| NMAP | NaviComputer Map File | GIS file |
| NMC | ArcGIS Explorer Map Content File | GIS file |
| NMF | ArcGIS Explorer Map File | GIS file |
| NV2 | Navionics Chart File | GIS file |