Selling my lowrance

I bought a new to me 2013 Legend and it has Lowrance electronics with structure scan box and linked to 2 hds units. I tried to learn to use them but decided to go with what i know and put some Birds on boat. When i started taking off the Hds units that was fine but the structure box has a cable marked transducer. Is this a seperate transducer from the side scan. i know i had 2 transducers on my birds one in hull and the SI on outside.

Thanks for the help

Rut

That is the structure scan transducer. It will be mounted outside on the back of the boat, normally. Good luck with your new birds.