This is a great basic GPS/Sonar for the price. Dragonfly Pro combines GPS navigation with Raymarine’s advanced dual-channel CHIRP sonar. Dragonfly Pro will change your underwater view and maximize your time fishing with Raymarine’s wide spectrum CHIRP technology. Easily identify fish and underwater objects with photo-like sonar images from the DownVision channel and target fish with the conventional CHIRP sonar channel. A built-in 50-channel GPS delivers precision guidance and built-in Wi-Fi lets you stream live sonar right to your smartphone.