Respectively featuring 4.3 in., Hi-Res, grayscale and color displays, Mark-4 and Elite-4 CHIRP series combine CHIRP Sonar with DownScan Imaging™ technology; daylight-viewable, LED-backlit display; built-in GPS antenna; and HD mapping options. CHIRP sonar technology improves target resolution and noise rejection to provide clear, viewable targets. By using DownScan Imaging view, anglers are provided with picture-like images of fish-holding structure beneath boat.