The Humminbird 678c HD is currently the most basic fish finder in the 600 series. It's also the cheapest one, but despite the fact it doesn't support any navigational features or superior sonar technology such as Side Imaging, Down Imaging or 360 Imaging, this model still is quite a reliable one. Just like the other units in the 600 series, the 678c HD comes with a 5-inch … [Read more...] about Hummingbird Fish Finder 678c HD Review