Garmin ECHOMAP Plus 4 in. Chartplotter/Sonar Combos - TackleDirect
Amazon.com: Garmin ECHOMAP Plus 43cv, 4.3-inch Sunlight-readable Combo, Includes GT20 Transducer, with U.S. Lakevu G3 Maps and Clearvu and Traditional Chirp Sonar : Electronics
User manual Garmin echoMAP CHIRP 52cv (English - 6 pages)