Garmin GT23M-TH Thru Hull Transducer

The Garmin GT23M-TH Thru Hull Transducer is engineered for serious saltwater anglers, delivering premium CHIRP sonar performance and DownVü imaging from a rugged stainless-steel thru-hull mount. Its durable design and broad coverage make it ideal for coastal and offshore fishing, providing crisp fish arches and detailed underwater structure.

• Through-hull stainless steel design: Robust marine performance built to withstand harsh saltwater conditions.
• Dual CHIRP sonar: Traditional CHIRP and DownVü scanning for both broad search capability and high-resolution imaging.
• Frequencies: Traditional CHIRP 80-160 kHz; DownVü CHIRP 245-275 kHz and CHIRP 445-465 kHz.
• Power handling: Traditional 600 W; DownVü 500 W for strong, clear returns.
• Maximum depth: Traditional up to 1,800 ft; DownVü up to 1,000 ft.
• Beam Width: Traditional LF/HF (-3 dB): 24°/13°; DownVü: 2.0×51° at 260 kHz and 1.4×29° at 455 kHz.
• Water temperature: Yes — water temperature sensing capability.
• Cable length: 30 ft for flexible installation options.
• Includes: Transducer, stainless steel stem, fairing block, isolation plate and bushings, extension cable, mounting hardware, and documentation.
• Dimensions: Transducer 228 × 62 × 41 mm; Stem 24 × 135 mm; Fairing block 323 × 116 × 64 mm.
• Compatibility: Designed for Garmin marine displays that support CHIRP traditional sonar and CHIRP DownVü scanning.

This transducer enables reliable, actionable sonar data across nearshore to deep-water scenarios, delivering crisp fish arches and detailed underwater structure with excellent target separation. The robust thru-hull installation, comprehensive mounting hardware, and 30 ft cable offer flexible, straightforward setup while maintaining optimal performance in challenging saltwater environments.