Thesaurus Term/Concept: SONAR SURVEY
| Identifier | 147265 |
|---|---|
| Class | EVENT TYPE |
| Status | Preferred |
| Index? | Yes |
| Scope Note | Active sonar systems are based on the behaviour of sound waves in water; acoustic energy is transmitted and the time for the returning echo is measured to allow submerged seabed features to be mapped. Use specific type where known. |