Garmin Transom/Trolling Motor Mount Dual Beam Transducer This dual beam transducer replaces the one included with your echo series 500 W 4-pin transducer; an operating frequency of 77 to 200 kHz; a beam width of 45 to 15 degrees; and mounts on a 0 to 70 degree transom. When using with a 6-pin Garmin sounder, transducer adapter cable part number 010-11614-00 is required. When using with the echo MAP 50s/70s, transducer adapter cable part number 010-11948-00 is required.