Originally Posted by
CrappiePappy
Because the jig IS "changing distance" .... and as you've previously noted, the transducer/sonar ping can only tell distance between it and the object that's reflecting the signal. The interpretation of that signal (the image) isn't shown in actual 3d ... but in 2d on the screen ... so the reflected signal is displayed "sideways". The DI is directly down +/- ... so the reflected signal is displayed "up/down".
That's how I understand it, anyway.
... cp
Right answer. Distance to transducer.
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