HUMMINBIRD Helix 7 SI portable kayak mount.
This is a video of a cool little project I just finished up. I mounted a Humminbird Helix 7 SI/GPS G2 on a Fishfindersmounts.com battery box. It's the small 5.5 aH box, but I wanted MORE! So, Nocqua 10aH lithium ion battery to the rescue. Battery and fish finder are all mounted together. Best thing is, I mount it on a quick release, so it's completely portable for charging and to keep the thiefs away.