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Originally Posted by Inajira
I am inclined to say no, I think its just an estimate based on passive listening to the loudness of the screws. I thought that the only time you're pinging is when you're using the echometer to determine depth. Can anyone confirm this??
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But that's just when he listens. If my memory serves me well you can only ask a range when you have sonar installed, and that one could make some detectable sound I reckon.