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The GSD 21 black box option is the way to go for adding sonar capabilities to any GPSMAP 276C, 172/172C, 182/182C, 192C, 292/392/492, 2006/2010 series, 2206/2210, and the 3000/3200 series. The GSD 21 add-on will produce 500 watts at 50/200khz serving for excellent results in shallow and deep water applications up to 1500ft. With Garmins See-Thru® technology, you will then be able to seperate fish from underwater structures and even water temperature changes.
The GSD-21 comes with a variety of display options, which include: 3 fish symbol sizes, adjustment bar,auto ranging and even 2x, 4x auto and manual zooming. Coming equipped with Garmin's proprietary Depth Control Gain (DCG®) allow's the GSD-21 to automatically adjust it's sensitivity to the current depth. System alarms include: 3 size fish, low battery, shallow and deep water.
Easy installation, waterproof to ipx-7 standards, variety of transducer options and comes standard with a 30 ft cable and mounting kit. Transducer sold seperately.
The GSD-21 comes with a variety of display options, which include: 3 fish symbol sizes, adjustment bar,auto ranging and even 2x, 4x auto and manual zooming. Coming equipped with Garmin's proprietary Depth Control Gain (DCG®) allow's the GSD-21 to automatically adjust it's sensitivity to the current depth. System alarms include: 3 size fish, low battery, shallow and deep water.
Easy installation, waterproof to ipx-7 standards, variety of transducer options and comes standard with a 30 ft cable and mounting kit. Transducer sold seperately.
