Garmin GT15M-THF 20° Stainless Steel Thru-Hull CHIRP Transducer (010-02868-02)

Introduction

The Garmin GT15M-THF 20° Thru-Hull CHIRP Transducer is engineered for anglers and boaters with steeper hull designs who require dependable sonar performance and streamlined installation. Its flush-mounted stainless steel housing incorporates a 20° internally tilted element that keeps the sonar beam properly aligned with the water, eliminating the need for a fairing block while minimizing drag.

Operating across a broad midband CHIRP frequency range of 85–165 kHz, the GT15M-THF delivers crisp fish arches, accurate bottom contours, and detailed underwater structure imaging. With depth capability of up to 1,200 feet in saltwater and 1,900 feet in freshwater, it provides reliable sonar performance for recreational fishing, offshore adventures, and cruising. Garmin Auto-ID technology further simplifies installation by automatically recognizing and configuring the transducer on compatible Garmin sonar systems.

Key Features

Midband CHIRP Sonar

• 600-watt CHIRP traditional sonar.
• Frequency range of 85–165 kHz.
• Produces crisp fish arches.
• Clearly identifies underwater structures.
• Accurate bottom depth readings.

Outstanding Depth Performance

• Maximum depth up to 1,900 ft in freshwater.
• Maximum depth up to 1,200 ft in saltwater.
• Reliable bottom tracking.
• Excellent deep-water capability.

Superior Sonar Clarity

• High-definition CHIRP imaging.
• Excellent target separation.
• Low-noise sonar operation.
• High-resolution underwater returns.
• Optimized ping sensitivity.

Stainless Steel Thru-Hull Design

• Durable stainless steel housing.
• Flush-mounted installation.
• Reduced hull drag.
• Optimized sonar beam orientation.
• Designed for 20° tilt installation.
• Suitable for hull deadrise between 16° and 24°.

Fast Water Temperature Sensing

• Integrated water temperature sensor.
• Fast-response temperature readings.
• Supports changing fishing conditions.
• Displays live water temperature.

Garmin Auto-ID Technology

• Automatic transducer recognition.
• Plug-and-play installation.
• Automatic sonar configuration.
• Seamless Garmin compatibility.

Wide Hull Compatibility

• Compatible with fiberglass hulls.
• Suitable for composite hulls.
• Supports steel hulls.
• Compatible with aluminum boats.
• Suitable for wooden hulls.

Sonar Performance

The Garmin GT15M-THF 20° Transducer delivers exceptional underwater detail by sweeping across the medium-frequency CHIRP range of 85–165 kHz. This broad frequency coverage generates crisp fish arches, accurate bottom definition, and excellent target separation, allowing anglers to clearly distinguish fish, bait schools, underwater structures, and bottom contours.

Its 600-watt output, combined with optimized ping sensitivity and low-noise operation, ensures dependable sonar performance in both freshwater and saltwater environments while maintaining outstanding clarity at greater depths.

Usage Instructions

Install the Garmin GT15M-THF 20° Transducer according to the supplied installation instructions. This model is specifically designed for vessels with a hull deadrise between 16° and 24°, ensuring proper sonar beam alignment and maximum performance.

Connect the 8-pin transducer to a compatible Garmin chartplotter or sonar system. Garmin Auto-ID technology automatically detects the transducer and configures the appropriate sonar settings, allowing for fast and simple plug-and-play installation.

Design & Build

The Garmin GT15M-THF features a rugged stainless steel thru-hull housing designed to withstand demanding marine conditions while providing long-lasting corrosion resistance. Its flush-mounted profile minimizes drag, and the internally tilted 20° element maintains an accurate vertical sonar beam without the need for a fairing block. Suitable for a variety of hull materials, it offers dependable performance season after season.

Design Highlights

• Stainless steel thru-hull construction
• Flush-mounted design
• 600-watt CHIRP sonar
• Midband frequency range (85–165 kHz)
• Traditional CHIRP sonar
• 8-pin connector
• Maximum depth up to 1,900 ft (freshwater)
• Maximum depth up to 1,200 ft (saltwater)
• 16°–24° beamwidth
• Integrated water temperature sensor
• Garmin Auto-ID technology
• Plug-and-play installation
• Optimized sonar sensitivity
• High-resolution fish arches
• Superior target separation
• Low-noise sonar performance
• Compatible with fiberglass, composite, steel, aluminum, and wood hulls
• Designed for 20° tilt installation
• Suitable for 16°–24° hull deadrise

Final Verdict

The Garmin GT15M-THF 20° Stainless Steel Thru-Hull CHIRP Transducer is an excellent choice for anglers and boaters with steep-deadrise hulls who need reliable, high-definition sonar performance. Its wide midband CHIRP frequency range, impressive depth capabilities, and outstanding target separation make it easy to locate fish and interpret underwater structures with confidence.

With durable stainless steel construction, integrated water temperature sensing, Garmin Auto-ID technology, and optimized installation for 16° to 24° hull deadrise vessels, the GT15M-THF delivers dependable sonar performance for both freshwater and saltwater adventures.