Originally Posted by
constructskeeter
Well I will say this my buddy has a late 90's express aluminum boat that he just mounted a ducer, Hummer 587 just like mine, to the back of the boat. His only gripe now is once it shows fish it's showing them at the back of the boat not at the front where he's fishing as he's done past them. I said well you and I both know from having bass rigs the only way to stop that is to get a finder at the front and back. Back so you can run watching depth and front one to fish off of. As for the mounting of the ducer in back of his little Aluminum boat it recommends drilling the holes in the back of the boat, from outside now and attaching the ducer right at the bottom where the only thing showing its the about half the ducer. The ducer has a seam bout half way down it where you line up with the bottom of the boat. The instructions from Hummingbird show that though. It reads great for him even going near 30mph down the lake. A little bit of clutter while moving, prolly from prop distortion though and he could set his sensitivity down just a hair and live with that as he agreed. I've heard there's no way to mount and in floor setup of the ducer in an aluminum boat as it won't read through the aluminum like it will fiberglass. Good luck either way you go and glad to be of any help.