echo ranging : 58 phrases in 14 subjects |
Acoustics | 3 |
Biology | 1 |
Electronics | 2 |
Fish farming pisciculture | 2 |
Geophysics | 1 |
Hydrology | 1 |
Makarov | 3 |
Military | 5 |
Nautical | 15 |
Navigation | 5 |
Oceanography & oceanology | 1 |
Shipbuilding | 1 |
Technology | 15 |
Transport | 3 |