The Garmin GT15M-IH installs inside a fiberglass hull using four included plastic tanks, so there's no transom drilling and no cavitation interference at speed. Mid-band CHIRP sonar spanning 85–165 kHz delivers sharp target separation and reliable depth readings across a hull deadrise range of 0–25 degrees. For a dual-capability setup, pair it with an optional GT30-TM transducer and a separately purchased adapter cable to add scanning sonar at trolling speeds.

Specifications:

• Transducer Model: GT15M-IH
• Mount Type: In-hull (no transom drilling required)
• Number of Plastic Tanks: 4
• Sonar Type: Mid-band CHIRP traditional sonar
• Frequency Range: 85–165 kHz
• Power Rating: 600 W
• Connector: 8-pin
• Compatible Hull Material: Fiberglass
• Hull Deadrise Angle: 0–25 degrees
• Optional Companion Transducer: GT30-TM (requires adapter cable, sold separately)

⚠️ California Prop 65 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.