Garmin GSD 21

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Garmin GSD 21

For added flexibility, upgrade your Garmin plotter, to a full-fledged combination chartplotter/sounder at any time by adding a Garmin® GSD 21 "black box" sonar and transducer. The GSD 21 analog sounder adds detailed sonar data to your compatible Garmin chartplotter - See list of compatible units in 'more details'

Connect with CANet™

This black-box sounder connects directly to your chartplotter with a serial cable. To take advantage of UltraScroll™, which provides lightning-fast refresh rates, connect the GSD 21 to your chartplotter with CANet, Garmin's 1-megabit proprietary network.

Get Great Shallow and Deep-Water Performance

The high-dynamic range sounder provides exceptional performance in water as shallow as one foot to depths as great as 1,500 feet. The GSD 21 can connect to dual-frequency transducer (50/200 kHz) for deep-water performance and 500 watts of transmit power, or a dual-beamwidth transducer The GSD 21 analog sounder adds detailed sonar data to your compatible Garmin chartplotter (narrow/wide) for operation in shallow freshwater as well as deep water and a transmit power of 400 watts.

GSD 21: Puts eyes in the bottom of your boat

Please note: This product does not include a transducer. Garmin offers a complete selection of transducers that you can purchase separately as accessories.