depth sounding : 39 phrases in 15 subjects |
Cartography | 1 |
Communications | 1 |
Construction | 1 |
Electronics | 2 |
General | 2 |
Geophysics | 4 |
Makarov | 2 |
Military | 3 |
Nautical | 9 |
Navigation | 1 |
Oil and gas | 2 |
Physics | 3 |
Surveying | 3 |
Technology | 4 |
United Nations | 1 |