The Garmin GT12M is a bronze thru-hull transducer built for midsize fishing and cruising boats, delivering mid-band CHIRP sonar that resolves fish arches, structure, and bottom composition with exceptional clarity. Its flush-mount design minimizes hull drag while the 8-pin plug-and-play connection pairs directly with compatible Garmin chartplotters via auto-ID technology — no manual sonar configuration required.

Specifications:

• Transducer Type: Mid-band CHIRP traditional sonar
• Frequency Range: 85–165 kHz (medium band)
• Power Output: 350 W
• Beamwidth: 16°–24°
• Maximum Depth: 800 ft saltwater / 1,200 ft freshwater
• Cable Length: 50 ft
• Sensor Capabilities: Depth and temperature
• Connector: 8-pin
• Housing Material: Bronze
• Installation Type: Thru-hull, flush mount
• Compatible Hull Materials: Fiberglass, composite, wood
• Supported Deadrise Angle: 0° version accommodates hull deadrise angles from 0° to 7°

In the Box:

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

Resources:

• Installation Guide (PDF)