Remote, black-box sounder that transmits 500 watts at 50/200kHz. The sounder module sends data serially in a Garmin® proprietary format to up to two units on board. When viewed on Garmin chartplotters, full-featured sounder displays in either split or full-screen presentations. Auto-ranging, auto and manual zoom, optional fish symbols and See-Thru® technology. Transducer must to be purchased separately. Designed for use with the GPSMAP® 3006C, GPSMAP® 3010C, GPSMAPV 2006/2006C, GPSMAP 2010/2010C, GPSMAP182/182 and GPSMAP 232.