Garmin GT15M-THF 12 Degree 600W SS Thru-Hull Transducer

Engineered for reduced drag and optimal sonar performance on midsize fishing and cruising boats, the Garmin GT15M-THF 12 Degree 600W SS Thru-Hull Transducer delivers precise sonar from a flush-mounted design that minimizes drag and maximizes beam orientation for clear returns.

Featuring high-definition mid-band CHIRP, this rugged 8-pin, 600-watt stainless steel thru-hull transducer defines fish arches, structure, and bottom depth with outstanding detail on your chartplotter display, reaching depths of up to 1,200 ft in saltwater and 1,900 ft in freshwater.

Mid-band CHIRP sonar for crisp targets

Mid-band CHIRP technology provides high-resolution returns that distinguish fish and structure even in cluttered conditions, delivering clear arches and precise depth readings.

Broad frequency range for versatile waters

The transducer covers 85–165 kHz, delivering a broad, consistent coverage area with crisp arches and accurate depth on the water you’re fishing.

Smart, easy installation and robust build

Fabricated in stainless steel for durability, this thru-hull unit offers straightforward flush mounting to minimize drag and optimize beam orientation. Auto-ID technology lets Garmin devices automatically configure to the transducer, making plug-and-play setup effortless. It supports hull materials from fiberglass and composites to steel, aluminum, and wood, with tilt options to handle deadrise angles from 0–20 degrees without a fairing block.

Key specifications

• Transducer Power: 600 W
• Transducer Frequency: Medium band CHIRP, 85–165 kHz
• Beam Width: 24–16 degrees
• Max Depth: 1,200 ft (saltwater); 1,900 ft (freshwater)
• Cable Length: 50 ft
• Hull Materials: Fiberglass, composite, steel, aluminum, wood
• Transducer Type: Thru-hull, flush-mounted
• Deadrise Compatibility: 0–20 degrees (12° variant supported; tilt versions available)
• Depth/Speed/Temperature: Depth, speed, and temperature data supported

In the box: GT15M-THF transducer, jam nut, washer, thread isolator, hull isolator, and documentation.