If you’re part of that category, be sure that it’ll take you 3-4 hours and a tech-savvy friend to figure it all out. Luckily, though, we’re here to significantly shorten and simplify this process for you. We’ve compiled data from a couple of tutorials and our tech-savvy friends, as well as the textbook for the Humminbird 859 DI fish finder. This method will work for it perfectly and we also recommend it if you haven’t bought a fish finder already. All in all, you’ll only need an hour or so to complete all the steps necessary.