Can someone post a pic of transom mounted transducer

You should have a transducer in the bilge to read at high speeds. Almost any transom mount transducer is not going to do well at speed as it either gets too much turbulence from the hull, or its out of the water when completely up on pad. Look in the bilge to ensure the puck transducer has not come unglued (they are epoxied in), and the cable coming from it is hooked up. Your depth finder needs to “see” it as well as the transom mount.2017 Sabre FTD AE DC2017 Yamaha 175 SHOMK Fortrex 80Helix 10 Mega SI in consoleHelix 7 GPS SI GN2 on bow

Mine reads bottom at speeds too fast to be looking at a depth finder. Mid 60s most of the time, depending on how rough the lake is. Most transducers come with instructions on how to locate for best performance. I recently added a HDS 9 Gen 3 so I now have the 80/200 mounted next to the one in the picture. Both will read at speed. I use the HDS for side scan and GPS. The Elite 7x HDI for 2d and down image.