Garmin GT23M-TM Transducer — CHIRP Traditional & ClearVü Sonar for Coastal & Offshore Fishing

Overview

The Garmin GT23M-TM transducer is built for coastal and offshore anglers who want two CHIRP sonar experiences in a single transom mount. With an 8 pin connector and strong power ratings, this unit delivers clear arches and solid structure definition beneath the hull.

By combining mid band CHIRP traditional sonar with CHIRP ClearVü scanning sonar, you can switch between conventional bottom readings and near photographic views of what lies below. This dual capability helps you tailor your reading style to water depth and visibility without changing hardware.

Two CHIRP sonar experiences

CHIRP traditional sonar operates in the 80 to 160 kHz range and is rated up to 600 watts. This setup supports enhanced target separation and reliable display of fish arches as you move along a school or reef.

• Enhanced target separation makes arches easier to distinguish from clutter
• Reliable bottom detail across a range of depths

CHIRP ClearVü scanning sonar uses 260 and 455 kHz elements with a 500 watt rating. It provides a clearer, more detailed picture of underwater structure and suspended targets beneath the boat.

• Underwater structures become easier to identify and interpret
• Readings adapt to changing water conditions without losing definition

On board performance and design

Designed as a transom mount, the GT23M-TM places the sensing elements under the hull to read through wake and chop with consistent performance. The 8-pin connection supports reliable integration with Garmin displays, while the dual frequency setup offers flexibility in varying conditions.

In practice, this transducer helps you recognize schools or individual targets and to visualize seabed features such as ledges, wrecks, or grass beds. The combination of traditional and scanning sonar gives you a more complete picture and a better sense of what you are approaching on the next pass.

Real-world use cases include day-long offshore trolling for pelagic species and coastal scouting along breaklines. The dual sonar approach can be adjusted to balance coverage and detail as you move through tides and currents. Maintenance is straightforward; keeping the mounting area clean and following the included installation instructions can help preserve signal quality and longevity.

Installation and care

Follow the included instructions carefully to avoid damage to your boat during mounting and wiring. The transom-mount design is commonly compatible with many hull shapes, and the 8-pin transducer connector keeps wiring tidy and reliable for Garmin systems.