Garmin GT21-TM Chirp DownVu Xdcr Transom Mount Transducer

Dual-Sonar versatility for coastal and offshore anglers

The Garmin GT21-TM Chirp/DownVu Xdcr is a transom-mounted transducer that brings together traditional sonar and CHIRP ClearVü scanning sonar. This combination helps you read the water with greater clarity, from shallow coastal spots to deeper offshore zones, while you focus on the hunt rather than the tech.

Designed for anglers who value crisp targets and a solid view of what lies beneath, this transducer emphasizes a clear depiction of arches, bait, and submerged structure. It supports fast response temperature sensing and comes with mounting hardware and installation instructions to support a straightforward setup on many boats.

CHIRP ClearVü imaging for a clearer underwater view

CHIRP ClearVü imagery provides a detailed vertical view below your boat, helping you distinguish individual targets from clutter and to spot subtle bottom features as you move through the water column. The ClearVü element operates at 260/455 kHz with a 500 W power rating, delivering a sharp, more defined view of what’s below.

• 500 W CHIRP ClearVü imaging at 260/455 kHz for crisp underwater views.
• Enhanced target separation to differentiate fish arches from structure and cover.
• Clear depiction of underwater features, aiding situational awareness while navigating.

Traditional sonar for depth and broad coverage

The traditional sonar channel provides robust depth readings and wide-area scanning at 50/200 kHz with a 600 W rating. This helps you assess depth, contour lines, and larger bottom features, complementing the CHIRP view as you search along channels or reef edges.

• 600 W traditional sonar supports 50/200 kHz for depth and broad coverage.
• Pairs with CHIRP to offer a multi-frequency perspective on the water below.

What’s included and how it adapts to your boat

The GT21-TM includes an 8-pin transducer, mounting hardware, and installation instructions. A built-in fast-response temperature sensor provides quick water-temperature readings as conditions change across tides and spots.

Follow the included guidance to ensure a secure installation and to help protect your boat hull. The transom-mount design is adaptable to a range of vessels, offering a flexible imaging option for many boat setups.

Real-world use and potential benefits

Imagine gliding past submerged structure and seeing distinct arches with clear separation from surrounding clutter. Visualizing bottom contours in deeper water or near drop-offs can inform where you cast or position your boat. While imaging benefits can vary by conditions, the dual-sensor approach provides a richer underwater view that may support smarter decisions on the water.

Overall, the GT21-TM aims to deliver a versatile, dual-imaging solution that helps you understand what lies beneath your hull, without locking you into a single imaging mode. It’s built to be user-friendly, with essential hardware and instructions to simplify setup and use.