transducer questions

[mikesmiph]

Took my new 788hb out for the first time Saturday. Generally, it worked great. One issue was at speed, it didn't work. Showed all kinds of weird depths. I put the new one in the same place as the old one. I have a step in my hull that may be causing the problem. Thinking I should go to a through hull transducer. Can anyone tell me if this is the best way to go? And, where is the best place to mounm.t it?  Thanks

[rkillick]

us2 puck epoxied to the hull works for me. have to switch transducers back and forth between si and us2 in a menu.
not that big of an issue to do it only takes a couple seconds.

[mikesmiph]

I don't have si, so I wouldn't have to switch, right?

[LennyB]

I have two units. One is mounted on the transom and the other is epoxied inside. The external mount gives better detail (20% according to the manufacturer). I use it when idling around when I want to get a clean, accurate view. The internal one I use when on plain were high detail is not the big concern and I basically just want to know the depth. As far as getting garbage info on the display, I'd call Humminbird and talk to there techs for the best advice.

[rkillick]

yeah if you get two transducers. not sure, maybe not if they are the same model trans? i did like the quad beam transducer before the si. with the 788 i would put a us2 puck in the hull epoxied in for high speed and an external quad beam out the back for more detail. hit up HB for a more professional answer; that is one good thing about HB they answer the phone and usually have a good answer. good luck