Air Navigation System
| Directorate
| air navigation system | |
| avia. Canada | système de navigation aérienne |
| Directorate | |
| gen. | Direction principale |
| insur. | Direction |
| directorate | |
| gen. | direction; directoire |
| |||
| système de navigation aérienne | |||
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Air Navigation System : 32 phrases in 6 subjects |
| Astronautics | 1 |
| Aviation | 25 |
| Law | 1 |
| Natural sciences | 1 |
| Technology | 1 |
| Transport | 3 |