Your best option is to use a humminbird GPS. Like the one you would use in your boat. Get another power cord and mounting kit for it and away you go.
Ram mount in truck, on four wheeler, etc.
X2. I mounted a Helix 5 on a mini-RAM mount on the handlebar of my snow machine. For the power cord, I installed a cigarette plug-in so I can use it on the wheeler, sled, or in the truck. I couldn't be happier with it.