Raymarine's a78 Wi-Fi is a full-featured multifunction display with built-in CHIRP DownVision Sonar technology. The a78 Wi-Fi also features standard wireless networking so you can see and control the a78 from your Smartphone and Tablet using Raymarine mobile apps. The dual channel sonar in the a78 Wi-Fi lets you see fish and bottom structure like never before. The a78 Wi-Fi's CHIRP DownVision channel delivers stunning images of underwater structure, fish, wrecks, and more with photo-like clarity. The a78 Wi-Fi also features a CHIRP fish targeting channel for easy identification of bait fish and predators. Includes Navionics North America Gold +3,000 Lakes/Rivers, or you can upgrade to 3D charting with satellite photos with Navionics Platinum Plus charts.