Garmin AIRMAR DST800 Smart Sensor, thru-hull, Depth, Speed, Temp, 20ft, NMEA 2000 Airmar Smartsensor D/S/T, low-profile, N2K 235 KHz, 100 Watt depth sounder module w/ speed & temp sensors DST800 plastic low-profile thru-hull (2" shaft) NMEA 2000 data output w/ 20' cable