• Great for dual-helm boats; allows you to view and control sonar on one or two chartplotters

• External mounting to allow shorter transducer cable length on large boats

• 4,000 watts transmit power peak-to-peak (500 watts RMS)

• 1,500 foot max depth*

• Dual frequency 50/200 kHz (40/10) for shallow or deep-water performance

• Display options — auto ranging, 2X and 4X auto and manual zoom, 3 fish symbol sizes, adjustment bar

• Alarms — deep water, shallow water, 3 size fish, low battery

• Transducer auto sense — automatically displays speed and temperature data without menus

• See-Thru® technology — shows weak/strong returns simultaneously

• Depth Control Gain (DCG®) — automatically adjusts fishfinder sensitivity according to depth

• Size — just 4.75" W x 6.75" L x 2" H

• Waterproof to IPX-7 standards

• Easy installation

• Comes standard with a 30-foot cable and mounting kit

• Numerous transducer options including transom, plastic or bronze thru-hull, speed and temperature sensor.

* Depth capacity is dependent on water salinity, bottom type, and other water conditions
 

See-Thru® technology allows you to see fish, even in thermoclines.	View bottom information and navigation data at the same time.	The GSD 20's bottom lock feature allows you to view a section of the water column within a specified depth of the bottom, such as 10 feet.