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direction-finding : 212 phrases in 18 subjects |
| Agriculture | 1 |
| Air defense | 36 |
| Automobiles | 2 |
| Aviation | 33 |
| Earth sciences | 8 |
| Economics | 1 |
| Electronics | 20 |
| General | 12 |
| Geophysics | 3 |
| Mining | 1 |
| Nautical | 2 |
| Navigation | 3 |
| Oil / petroleum | 2 |
| Radio | 4 |
| Shipbuilding | 3 |
| Space | 34 |
| Technology | 42 |
| Telecommunications | 5 |