Fishing and Gear Technology (2+1) copy 1

Unit 16 - Electronic equipments for fishing

16.8.Omni Sonar
Omni sonar transmits sound pulses which effectively radiates from the transducer through a complete 360º and electronically scan the entire area while listening for echoes. The display shows the complete picture around the vessel for each transmission. Sonar performance is affected by retraction of sound, thermocline, density gradient and by the pitching and rolling. Audio output facility is not usually found in the echo-sounder but in SONAR audio out is through loud speaker. This is normally provided for operator’s convenience as he can work continuously without watching the display (eyes free operation). A skilled sonar operator can detect from the sound coming from the loud speaker potential fish targets, sea bed echoes including wrecks and other echo returns caused by vessel wakes.