Table 2. Specifications of the scientific echo-sounder and the recreational fish-finder.
| Boat and sounder details | Echo-sounder | Recreational Fish-finder |
|---|---|---|
| Transducer mount | side | transom |
| Transducer depth | 0.5 m | 0.5 m |
| Transducer | Simrad ES38-12 | Furuno 525TID-PWD |
| Settings | ||
| Frequency | 38 kHz | 200 kHz |
| Gain | 21.22 dB | default |
| Time varied gain (TVG) | 2 | |
| Sa correction | -0.67 dB | none |
| 3dB beam angle | 12° | 11° |
| Power | 1000 w | 600 w |
| Receiver band width | 2.41 kHz | not specified |
| Max ping range | 250 m | 206 m |
| Ping rate | 2–5 s-1 | 4–10 s-1 (100 m—30 m range) |