| Navaid Facility ID: | GMZ |
| Official Navaid Facility ID: | GMZ |
| Navaid Facility Type: | NDB |
| Navaid Name: | Grindstone Mountain |
| City: | BOWIE |
| State: | TEXAS |
| FAA Region: | |
| Latitude: | 33-36-19.303N (33.6054) |
| Longitude: | 097-46-25.389W (-97.7737) |
| Lat/Long Survey Accuracy: | 1 second or better |
| Owner: | CITY OF BOWIE |
| Operator: | CITY OF BOWIE |
| Common System Usage: | Yes |
| Public Use: | Yes |
| Navaid Class: | MHW |
| Hours of Operation: | 24 |
| Magnetic Variance: | 3.2 E as of 9/30/2025 |
| ARTCC High Altitude ID (Name): | ZFW (FORT WORTH) |
| ARTCC Low Altitude ID (Name): | ZFW (FORT WORTH) |