The GSD 20 is a remote, black-box
sounder that transmits 500 watts at 50/200kHz. Its designed for use with the
GPSMAP 2006 / 2006C, GPSMAP 2010 / 2010C, GPSMAP 182 / 182C and GPSMAP 232 to
provide SONAR capabilities to these units. The sounder module sends data
serially in a Garmin proprietary format to up to two units on board. When viewed
on Garmin chartplotters, youll see full-featured sounder displays in either
split- or full-screen presentations. Features include auto-ranging, 2X and 4X
auto and manual zoom, optional fish symbols and See-Thru technology, which
separates fish from thermoclines and structure.
