[RobertKWFL]

I just installed an i40 in my boat. I have no problem seeing it from 5-6' away.

 

[RobertKWFL]

I used the in-hull transducer for my uncored hull. It won't work through a core. I also somehow ordered a version of the transducer with the wrong connector. Easily resolved by splicing the connection, but better to get the right one in the first place.