Garmin GT12M Bronze Thru-Hull - 350W - 12 Degree

Meet the Garmin GT12M Bronze Thru-Hull - 350W - 12 Degree, a purpose-built flush-mounted transducer designed to reduce drag while delivering peak sonar performance on midsize fishing and cruising boats. This bronze thru-hull unit provides crisp, reliable returns for fish arches, structure, and bottom depth right on your display.

Midband CHIRP Traditional Sonar with an 8-pin, 350-watt bronze housing offers high-definition imaging that clearly defines targets down to 800 ft in saltwater and 1,200 ft in freshwater. Pairing power with precision, it helps you distinguish fish and structure with ease in a variety of conditions.

Key features and benefits

• Mid-band CHIRP sonar: Enhanced target definition for fish arches and underwater structures.
• 350 W transducer power for strong, clear returns and better separation of targets.
• Bronze thru-hull housing for durability, minimum drag, and optimal beam orientation.
• 85–165 kHz broad frequency range: Flexible coverage for different waters and visibility needs.
• Beamwidth 24°–16°: Wide coverage when scanning and tighter returns for detail.
• Maximum depths: 800 ft in saltwater / 1200 ft in freshwater for reliable performance across environments.
• Auto-ID Technology: Plug-and-play operation that automatically configures the sonar to the transducer.
• Hull compatibility: Configurable for fiberglass, composite, and wood hulls; available in tilt versions to accommodate deadrise angles from 0–20° without a fairing block, with 12° deadrise support.
• Depth/Temperature: Read depth and temperature on compatible Garmin displays for situational awareness.
• Transducer cable: 50 ft for installation flexibility.

Flushed into the hull, this transducer minimizes drag while delivering reliable, precise sonar returns. It’s designed to work seamlessly with Garmin chartplotters and ranges of hull materials, making it a versatile choice for midsize boats seeking accurate depth, structure, and fish targeting.

What’s in the box

• GT12M-THF transducer
• Jam nut
• Washer
• Documentation

Manufacturer details: Bronze transducer housing, 8-pin connector, 50 ft cable, and a robust design that supports hull deadrise from 8° to 15° without requiring a fairing block. Compatible with a range of Garmin displays to deliver dependable mid-band CHIRP performance for improved fishing and cruising decisions.