Garmin TM265LH Plastic Transom Mount Transducer with Depth & Temperature – 12-Pin (010-12378-20)

Take your sonar performance to the next level with the Garmin TM265LH Transom Mount Transducer, a powerful 1kW CHIRP transducer designed for serious anglers and offshore fishing applications. Engineered for exceptional deep-water performance, this high-performance transducer delivers crystal-clear target separation, precise bottom tracking, and detailed water column imaging.

Featuring dual-channel CHIRP technology (Low & High frequencies), the TM265LH operates across 42–65 kHz (low) and 130–210 kHz (high), providing superior depth penetration and high-resolution returns. With a maximum depth capability of up to 3,000 feet, it excels in offshore and deep-water environments. 

The transom-mount design allows for easy installation on a wide range of vessels, while the integrated temperature sensor provides accurate water temperature readings to help locate fish more effectively. Built with durable materials and a streamlined housing, this transducer ensures reliable performance in demanding marine conditions.

Compatible with select Garmin GPSMAP xsv chartplotters and GSD™ sonar modules, the TM265LH is an ideal upgrade for boaters seeking professional-grade sonar capabilities. 

• Dual CHIRP Frequencies: Low CHIRP (42-65 kHz) for deep-water penetration and High CHIRP (130-210 kHz) for detailed shallow-to-midwater imaging.

• Beamwidth: Varies between 16°–25° (Low) and 6°–10° (High) to balance coverage and precision.

• Integrated Sensors: Provides both depth and water temperature data to your display.

• Mounting: Designed for transom angles ranging from 3° to 21°.

Key Features:

• High-performance 1kW CHIRP transducer for offshore and deep-water fishing

• Dual-frequency CHIRP: 42–65 kHz (Low) & 130–210 kHz (High)

• Maximum depth capability of up to 3,000 feet

• Exceptional target separation and bottom detail clarity

• Transom mount design for easy installation (3°–21° transom angles)

• Built-in water temperature sensor

• Beamwidth: 16°–25° (low) / 6°–10° (high) 

• Compatible with Garmin GPSMAP xsv series & GSD 25 sonar module

• Durable construction for harsh marine environments

• Connector: 12-pin

• Part Number: 010-12378-20

Technical Specifications

• Power Rating: 1,000 Watts

• Maximum Depth: 3,000 feet

• Cable Length: 33 to 39 feet (varies by production batch)

• Compatibility: Works with Garmin GPSMAP 7600xsv series, GSD 25, and newer 12-pin units.

In the Box

• 1 x Garmin TM265LH Transducer (12-Pin)

• Transom Mounting Bracket and Hardware

• Installation Instructions

• Documentation

Upgrade your marine electronics with the Garmin TM265LH Transducer—a premium solution for anglers who demand deep-water accuracy, reliability, and professional-grade sonar performance.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.