| Abbreviation | Definition |
|---|---|
| GMMX | Marrakech-Menara, Morocco |
| GMMY | Kenitra, Morocco |
| GMMZ | Ouarzazate-Angads, Morocco |
| GMN | Greymouth, New Zealand |
| GMP | Gimpo International Airport, Seoul, Republic Of Korea (formerly SEL) |
| GMR | Gambier Island, Gambier Island |
| GMS | Guimaraes, MA, Brazil |
| GMTA | Al Hoceima-Cote du Rif, Morocco |
| GMTN | Tetouan-Sania Sania Ramel, Morocco |
| GMTT | Tangier-Boukhalef, Morocco |
| GNA | Grodno, Russia |
| GNB | Grenoble, France |
| GND | Grenada, Windward Islands |
| GNE | Ghent, Belgium |
| GNG | Gooding, Idaho, USA |
| GNI | Green Island, Taiwan China |
| GNM | Guanambi, BA, Brazil |
| GNR | General Roca, Rio Negro, Argentina |
| GNT | Grants, New Mexico, USA |
| GNU | Goodnews Bay, Alaska USA |