No one told me this at bass proa dn I did ask but the said just clamp the one which comes with the unit to the bottom. Was not real happy with this.

This is my first Humminbird!

I have used it once, will they still do the excahnge and when you say send the "transom mount" do you mean the transducer I just got with the 777c.

Also will that work a lot better?

thanks for all the info!

Johns