| Navaid Facility ID: | SMG |
| Official Navaid Facility ID: | |
| Navaid Facility Type: | TACAN |
| Navaid Name: | St Mawgan |
| City: | |
| State: | |
| FAA Region: | |
| Latitude: | 50-26-04.20N (50.4345) |
| Longitude: | 05-01-49.08W (-5.0303) |
| Lat/Long Survey Accuracy: | |
| Owner: | |
| Operator: | |
| Common System Usage: | |
| Public Use: | |
| Navaid Class: | |
| Hours of Operation: | |
| Magnetic Variance: | 0.5 W as of 9/30/2025 |
| ARTCC High Altitude ID (Name): | () |
| ARTCC Low Altitude ID (Name): | () |