Features:

• Analog Sonar Black-Box Sounder That Provides Fast Ultrascroll Displays
• 500-Watt (RMS) Sounder Capability
• For 2000 Series and 292/392/492 Series Chartplotters
• Includes The New High-Dynamic Range Analog Sonar Receiver

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Description:

Add depth to your chartplotter view with the GSD 20 series remote sounders. The GSD 21, powerful analog sonar, Garmin's first digital sonar, is robust unit designed to operate with stand-alone chartplotters or integrate with the Garmin CANet and Marine Networks.The GSD 21 is a black-box sounder that provides fast Ultrascroll displays and 500-watt (RMS) sounder capability to 2000 series and 292/392/492 series chartplotters featuring the Garmin CANet bus. The GSD 21 will work with a serial connection to other Garmin plotters without the CANet connection, but will not offer Ultrascroll capability. The unit's all-new, high-dynamic range analog sonar receiver provides exceptional performance in water as shallow as one foot on down to depths of 1500 feet. It connects to a dual frequency transducer (50/200 kHz) for deep-water performance or a single frequency, dual beam width transducer (narrow/wide) for operation in shallow fresh water as well as deeper water. It provides 500 W transmit power with dual frequency transducer or 400 W with dual beam width transducer.

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