Highest Rated Fishfinders
1
4.8/5
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4.6/5
3
4.6/5
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4.6/5
5
4.4/5

Standard Horizon FF525

The Standard Horizon FF525 black box sounder adds high-power dual-frequency fish finder capability to a long list of Standard Horizon multifunction displays, including the CP- and CPV-series, neither of which is equipped with their own internal sonar. We used a large-screen Standard Horizon CP1000C chartplotter display and a Standard Horizon

Standard Horizon FF520

The Standard Horizon FF520 black box sounder is an add-on component designed to provide sounder data to a number of Standard Horizon chartplotters, including the CP and CPV units, which are not equipped with an internal fish finder. We used a Standard Horizon CP180 chartplotter display and an Airmar P58

Sitex ES502

The Sitex ES502 black box sounder is designed to provide sonar data to a number of Sitex chartplotters, including the full ColorMax line, that are not equipped with an internal fish finder. We reviewed the ES502 black box fishfinder with an Airmar P58 transducer connected to a Sitex Colormax 5E

Raymarine DSM30 Review

The Raymarine DSM30 black box sounder is designed to provide fishfinder data to Raymarine C-series and E-series multi-function display units. It uses digital technology to continually monitor and adjust a number of parameters making the onscreen picture cleaner and more accurate when compared to older analog machines. This 600-watt dual

Raymarine DSM25 Review

Raymarine DSM25 black box sounder designed for use with the Raymarine A60 or A65. This 500-watt sounder is housed in a box approximately 8-inches by 5-inches with a depth of 2-inches. The black box, actually this one is grey, must be mounted on a bulkhead or deck area near the

Lowrance StructureScan Review

The Lowrance StructureScan system uses an LSS-1 black box sounder and proprietary transducer to add automated side and down scanning capabilities to HDS-series Lowrance MFDs. A single multifunction transducer provides both side and down scanning capability. Up to 500 watts of power can be sent out by this transducer using

Lowrance StructureScan HD Review

Lowrance StructureScan HD utilizes an LSS-2 black box coupled to a proprietary transducer to add side and down scanning capabilities to certain Lowrance MFDs. A single multifunction transducer provides both side and down scanning capability. Up to 500 watts of power can be sent out by this transducer using one

Garmin GSD22 Review

The Garmin GSD22 is the latest in a line of black box sounders designed to provide fishfinder data to a number of Garmin chartplotters not equipped with an internal fish finder. This unit is capable of producing 500-, 1000-, or 2000-watts (RMS) of output power depending on the transducer coupled

Furuno DFF1 Review

The Furuno DFF1 black box sounder is an add-on network sonar designed to provide data to any of the Furuno NavNet multifunction display units. We used a Furuno NavNet 3D 12-inch MFD coupled to an Airmar B44V thru-hull transducer to test the DFF1 black box sounder. This unit is capable

Black Box Sounders Main Page

A black box sounder is a generic name for a marine electronics device that contains the electronic guts of a fish finder in a self-contained ‘black box’, most of the time the box is not actually black. They came into being in the early 1980’s when personal computers were first