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An omni sonar term, in plain English.
Listening to echoes through a speaker. The CSH-10 outputs a 1 kHz tone at 10 W.
See it in action
The free lessons show where this shows up on a real screen: start with the learning path, try it yourself on the omni trainer, or look it up on real CSH-10 captures in the field guide. Owners and captains talk settings every day on the forum.