Garmin echoMAP CHIRP 52dv without transducer The Power of Simple: Easy-to-use, Easy-to-install Chartplotter/sonar Combos with Sunlight-readable, Auto-dimming Display and Backlit Keypad. Available in 4-inch, 5-inch Square and 7- and 9-inch Widescreen Display Sizes. Chirp Sonar - Chirp Sends a Continuous Sweep of Frequencies Ranging from Low to High, and Interprets Frequencies Individually upon Their Return. With More Information, Chirp Sonar Is Able to Create Crisper Fish Arches with Better Target Separation. The built-in sonar capabilities of echoMAP 52dv include CHIRP sonar, the most sophisticated sonar technology available for the fishing and boating public Best-in-class Internal 5 Hz Gps - Internal 5 Hz Gps Updates Position and Heading 5 times per Second to Make Marking and Returning Accurately to Waypoints Easier. Clearest Scanning Sonar on the Water - the Dv Series Comes with Built-in 500 W (Rms) Chirp Traditional Sonar and Chirp Downv Scanning Sonar. The Sv Series Offers All of the Same Features plus Chirp Sidev Scanning Sonar.