Electronics dunce needs advice-Terrova w/Ipilot connecting Humminbird.

I bought a used Terrova/I-pilot and love it. I also have a 385CI Humminbird with what I believe is a bad transducer. I noticed there is a built in transducer on my I-pilot but after looking at the website, I don't believe I have Ipilot Link. I am not sure if I have to have that to be able to link my terrova to my Humminbird. I have an 80lb. 24 volt with US2. I have to assume that this a built in transducer on the unit given the shape of it. Just wondering how it connects with Humminbird. The one cable lead from the TM head that is not connected to anything is round with 4-prongs and all of my Humminbird connections are square. Hope this makes sense...

Thanks for any advise.

You will need the adapter.
MKR-US2-1 Garmin Adapter Cable
check this link for your model humminbird.

MKR-US2-8 is the one you need. you can find it cheaper on the internet than Minn kotas store.
one of the sponsors of C.com should sell them also.

Yep, what he said, all I use is the US2 on my Terova

Check on The Sportsmans Guide web site. Headset place I found mine and shipping was cheaper than most.

Just call me, Joe. I'll splain it to ya. I even have the $37 cable you need to make it work.