Garmin Airmar R109LHW Thru-Hull Transducer, 2kW, 38-75kHz and 150-250kHz, Depth & Temp

Overview

The Garmin 010-12182-20 is a 2 kW thru-hull transducer built around the Airmar R109LHW element, with CHIRP coverage across 38 to 75 kHz and 150 to 250 kHz.

It pairs a low band for deep-water sounding with a high wide band that holds a 25° beam across the range, which helps when you want more coverage under the boat while working shallower water.

The urethane housing uses a fairing-style mount to account for hull deadrise up to 22°, and it also provides depth and fast-response water-temperature sensing.

Key features

• 2 kW dual-band CHIRP: 38 to 75 kHz (low) and 150 to 250 kHz (high wide)
• High wide band keeps a constant 25° beam for broader coverage in shallower depths
• Low band beamwidth varies across the range (19° to 10° port-starboard; 10° to 5° fore-aft)
• Thru-hull, external-mount housing with fairing-style mounting for deadrise up to 22°
• Depth and water-temperature sensing
• 49 ft (15 m) cable for routing to a sonar module at the helm
• Bare-wire termination for hard-wiring to compatible sonar equipment
• Xducer ID technology for transducer identification on supported systems

Compatibility and fit

This is a dual-band, CHIRP-ready transducer. It requires sonar hardware that supports a 2 kW transducer and the 38 to 75 kHz and 150 to 250 kHz bands. Confirm both frequency support and your sounder’s wiring method before committing to the hull cutout.

The housing is listed as compatible with common hull materials, but thru-hull installs still depend on proper bedding, access inside the bilge, and good cable routing. Plan the location so the face stays in clean water at speed and is clear of strakes, steps, and trailer bunks.

Installation and setup

Most thru-hull installs are a haul-out job. Measure deadrise at the mounting point and align the fairing so the transducer face sits square to the water flow. On cored fiberglass, seal the core around the hole to keep water out of the laminate.

Route the cable away from ignition wiring, alternator leads, and other high-current runs when possible. Leave a service loop so the transducer can be inspected without stressing the cable.

Use on board

This setup fits boats that split time between deeper drops and nearshore structure. The low band handles the deeper work, while the high wide band is useful when you want coverage and clear targets in the upper water column.

Maintenance and care

Inspect the outside face for growth and clean it with a non-abrasive pad as needed. During seasonal service, check the bedding line and the inside hardware for any sign of movement or seepage, especially after trailering or hard impacts.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

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