The Garmin GT15M-IH mounts inside a fiberglass hull rather than on the transom, eliminating cavitation interference at high speeds while delivering continuous, accurate depth readings. Designed for hull deadrise angles of 0–25 degrees, it uses mid-band CHIRP sonar (85–165 kHz) to produce crisp target separation and detail. Pair it with a GT30-TM transducer and an adapter cable to combine high-speed depth performance with scanning sonar capability at trolling speeds.

Specifications:

• Transducer Model: GT15M-IH
• Mount Type: In-hull (plastic tanks, 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.