Garmin GT21-TH Thru Hull Downvu Transducer

Garmin GT21-TH Thru Hull Downvu Transducer provides crystal-clear sonar and precise underwater imaging from a through-hull installation, ideal for coastal and offshore anglers seeking reliable readings and detailed visuals.

• Through-hull stainless steel stem: Durable mounting that delivers stable sonar returns across hull deadrises up to 25°.
• CHIRP ClearVü scanning sonar: 500 W with 260 kHz (245–275 kHz) and 455 kHz (445–465 kHz) ranges for ultra-detailed underwater visualization and standout target separation.
• Traditional sonar: 600 W at 50/200 kHz for solid bottom tracking and reliable fish finding in deeper water.
• ClearVü beamwidth: 2.0°×51° at 260 kHz and 1.4°×29° at 455 kHz for broad coverage and focused imaging.
• Traditional beamwidth: 40°/10°.
• Maximum depth: Traditional up to 1,500 ft; ClearVü up to 1,000 ft.
• Depth and temperature sensing: Real-time depth and water temperature monitoring.
• Number of pins: 8-pin.
• Cable length: 30 ft.
• Supported deadrise: Up to 25° deadrise.
• What’s in the box: 8-pin transducer with stainless steel stem, fairing block, isolation plate and bushing, mounting hardware, installation instructions, and a 30 ft cable.

Designed for coastal and offshore adventures, the GT21-TH delivers crisp fish arches, clear structural details, and dependable readings from the moment you install it. By combining traditional sonar with CHIRP ClearVü scanning in a single through-hull package, you can locate bottom contours, underwater structure, and fish with confidence at greater ranges, while real-time depth data and temperature readings keep you informed about current conditions. The straightforward installation and robust construction make it a practical upgrade for serious anglers seeking precise, reliable sonar performance.