Overview

The Garmin 010-11647-20 is a bronze thru-hull mount transducer that supplies depth and temperature data for a compatible sonar setup. It is rated at 1 kW and is specified for depths up to 3,000 ft, making it a good fit when you need bottom tracking that holds up in deeper water.

This model covers two frequency ranges, 42 to 65 kHz and 85 to 135 kHz, so you can work with different bottom conditions and target depths. Beamwidth is specified at 16 to 25 degrees and 11 to 16 degrees, and the housing is intended to match hull deadrise from 0 to 20 degrees.

Key features

• Bronze thru-hull transducer for below-waterline mounting with depth and temperature sensing
• 1 kW power rating with specified depth capability up to 3,000 ft
• Operating frequency ranges: 42 to 65 kHz and 85 to 135 kHz
• Specified beamwidth ranges of 16 to 25 degrees and 11 to 16 degrees
• Designed to suit hull deadrise angles from 0 to 20 degrees
• Listed compatibility with the Garmin GSD 26 CHIRP Professional Sonar Module

Compatibility and fit

This transducer is intended to be paired with a compatible sonar module and display setup, and it is specifically listed for use with the Garmin GSD 26 CHIRP Professional Sonar Module. Before ordering, confirm your sonar hardware supports the operating frequency ranges shown for this model and that your hull deadrise falls within the 0 to 20 degree specification.

Because it is a thru-hull style, plan for access to both sides of the mounting location for installation and service. Make sure the chosen spot stays in clean water flow underway, away from steps, strakes, intakes, and turbulence that can affect sounder performance.

Installation and setup

Thru-hull mounting requires drilling the correct hull opening, bedding the housing properly, and tightening to the recommended torque so the seal remains stable through vibration and temperature swings. Take time to dry-fit the location, check clearance for tools and cable routing, and keep the cable run protected from chafe in bilges and rigging spaces.

After installation, use your electronics setup steps to confirm the transducer selection, temperature reading, and depth performance at idle and on plane. A quick check at the dock and again after the first run helps catch any seepage or cable strain early.

Use on board

This transducer suits boats that spend time offshore or in areas where deeper soundings matter, and it is also a practical choice for anglers who want bottom information that remains readable when conditions change. It works well on cruising powerboats and larger sailboats where a thru-hull install is preferred for consistent readings at speed.

Maintenance and care

Inspect the thru-hull area regularly for signs of loosening, seepage, or impact damage, especially after trailering, haul-outs, or grounding events. Keep the exterior face clean of heavy growth and paint buildup so the sonar signal is not muted, and recheck the sealing surfaces during routine bottom service.