Garmin GSD 25 Premium Sonar Module - GA-0100115900Garmin GSD 25 Premium Sonar Module - GA-0100115900
GSD 25, MFG# 010-01159-00, Sounder Module, 1KW, with traditional 50/77/83/200KHZ, dual channel 40-250KHz CHIRP, SideVu/DownVu CHIRP 260/455/800KHZ sonars. For use with GPSMAP 8000 Glass Helm and GPSMAP 7400/7600 Series MFDs.