Min. Kota universal sonar to hummingbird 788 hd di problem

[Ranger Rick]

Just purchased a min Kota Terrova trolling motor bought the cable to make it work on a hummingbird 788 HD DI graph. I was getting inaccurate depth readings. (2 feet would read 68 feet) I changed some frequency adjustments in the graph now I am getting correct and incorrect depth readings. It will read correctly then jump to 60 feet then back to correct reading. Any ideas. Thanks in advance.

[Wayne P.]

What transducer is in the Terrova?

[Ranger Rick]

It has the four pin connector. Not the 14 pin mega DI connector. Hope this helps.

[Wayne P.]

That would be the US2 and it is tuned to 83/200 kHz and is 2D sonar ONLY==no Down Imaging.

Your unit uses 200/455 kHz by default. Don't know about unit that old, but see if you have a Connected Transducer setting that uses 83/200 kHz.

If you want to have Down Imaging, you have to put a Down Imaging transducer on the bottom of the motor.
The DI trolling motor puck version that matches the unit default frequencies is the XTM 9 DI 25 T.

[Ranger Rick]

Thanks for the info. Looks like I will be putting the old transducer back on.