echo sounding: 43 phrases in 16 subjects |
Cartography | 1 |
Communications | 1 |
Electronics | 3 |
General | 2 |
Geophysics | 1 |
Hydroacoustics | 1 |
Hydrology | 4 |
Makarov | 3 |
Metrology | 2 |
Military | 1 |
Nautical | 7 |
Navigation | 6 |
Physics | 1 |
Technology | 7 |
Telecommunications | 1 |
United Nations | 2 |