Garmin GT23M-TM, sonde en plastique pour montage sur tableau arrière, CHIRP bande moyenne (80-160 kHz, 600 W)/CHIRP ClearVü (260/455 kHz, 500 W) (8 broches) - Garmin

Sonde GT23M-TM - tableau arrière CHIRP/ClearVü - visuel officiel Garmin 2

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

Opt for additional installation assistance

Save 18%

Garmin

010-12404-00

GT23M-TM Transducer - Rear Mount CHIRP/ClearVü

Designed for coastal and offshore fishing, the Garmin GT23M-TM transducer is a plastic rear-deck mount transducer integrating a traditional CHIRP mid-band sonar (80-160 kHz, 600 W) and a CHIRP ClearVü scanning sonar (260/455 kHz, 500 W). This 8-pin model, which monitors depth and temperature, is a versatile and current solution in the GT range for detailed underwater detection. It is supplied with its mounting bracket, mounting hardware, and documentation.

Installation: Rear display

Rear display Stainless steel through-hull

Retail priceBenefit from the professional rate

$298.40 USD

$298.40 USD ~~$365.75 USD~~

Shipping calculated at checkout.

In stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

Opt for additional installation assistance

Technical specifications

Supported sonar technologies	CHIRP mid-band, ClearVü
Fishfinder frequencies	80-160, 260, 455
Peak power	600.0
Max depth reading	549.0
Transducer material	Plastic
Sonar connector type	8-pin
Cable length	9.1
Integrated temperature sensor	Yes
Compatible displays	Garmin chartplotters and depth sounders compatible with 8-pin connectors
Bus compatibility	None
Wired network	Garmin proprietary sonar connection (8-pin)
Wireless connectivity	None
Mounting type	Rear-panel mounting
Certifications	CE
Beam coverage angle	Traditional: 24°-13°, ClearVü: 2.0°x51° (260 kHz), 1.4°x29° (455 kHz)
Cable Clamp Included	Yes
Cable Clamp Pilot Hole Size Mm	3.2
Cable Clamp Screw Length Mm	12
CHIRP high frequency	260/455
CHIRP low frequency	80-160
Chirp Medium Band Beam Angles	24° to 13°
Clearvu Beam Angles	2.0°x51° (260 kHz), 1.4°x29° (455 kHz)
Clearvu Power	500
Fishing type	Sea, Lake, River
Hull Deadrise Angle Max Compatible	25
Integrated speed sensor	No
Max Depth Clearvu	305
Mounting Screw Length Mm	20
Mounting Screw Pilot Hole Depth Mm	15
Release year	2015.0
User level	Intermediate
Warranty	2.0

Detailed description

Designed for inshore and offshore anglers, the Garmin GT23M-TM transducer is a plastic rear-mount transducer integrating traditional CHIRP and CHIRP ClearVü sonar technologies. This 8-pin model offers a versatile solution for detailed underwater detection, with depth and water temperature tracking capabilities.

Advanced Sonar Performance

The Garmin GT23M-TM uses a traditional mid-band CHIRP sonar operating on a frequency range of 80 to 160 kHz with 600 W power. This configuration delivers well-defined fish arches and superior target separation up to a maximum depth of 549 meters (1,800 feet), with a beam angle ranging from 24° to 13°. In addition, the CHIRP ClearVü scanning sonar operates on frequencies of 260/455 kHz (specifically 245-275 kHz and 445-465 kHz) with 500 W power, providing detailed images of underwater structures down to 305 meters (1,000 feet) depth, with beams of 2.0°x51° at 260 kHz and 1.4°x29° at 455 kHz. The transducer cable measures 9.1 meters (30 feet).

Positioning and Compatibility

The GT23M-TM transducer positions itself as a robust intermediate option in Garmin’s transducer range. Unlike traditional models, it adds ClearVü capability for improved structure visualization. It differs from more advanced and costly SideVü or LiveScope™ transducers, which offer side-scanning or real-time imaging. Compared to thru-hull transducers that require professional installation and are often preferred for high speeds or complex hulls, the GT23M-TM is simpler to install on the transom. It is compatible with transom angles from 0° to 70° and works with all hull materials. It is particularly suited to trailerable boats and delivers optimal results at speeds below 34 mph in waters with minimal turbulence. The kit includes the transom mount, mounting hardware, and necessary documentation.

Documentation

Type	Nom
	User Manual - Garmin Transducer Placement Guide
	Installation instructions - Garmin GT23M-TM transom-mount transducer installation instructions

Expert opinion

Pol CONIN

Digital Manager

« Technical evaluation of the Garmin GT23M-TM fishfinder for inshore and offshore fishing »

The Garmin GT23M-TM fishfinder represents an excellent compromise for recreational boaters and anglers seeking detailed seabed and fish visualization without the investment or installation complexity of through-hull systems. Its plastic design for transom mounting makes it accessible to a wide range of powerboats, particularly those regularly launched and retrieved, thanks to its ease of installation and maintenance compared to through-hull transducers.

The integration of traditional CHIRP mid-band (80–160 kHz, 600 W) and CHIRP ClearVü (260/455 kHz, 500 W) is a major asset. Traditional CHIRP delivers excellent fish detection and target separation, essential for distinguishing fish schools and structures. ClearVü, in turn, provides near-photographic images of submerged structures and fish directly beneath the boat, which is crucial for trolling or precise fishing spots. This combination is particularly relevant for inshore fishing and moderate offshore trips where the maximum depth of 549 m in traditional CHIRP and 305 m in ClearVü is sufficient.

During installation, it is imperative to choose a location away from turbulence generated by the propeller, hull strakes, or other appendages to ensure signal quality, especially at higher speeds. While transom mounting is simpler, it exposes the transducer to shocks and external damage, particularly during launching or towing maneuvers. It is also important to note that for stepped-hull powerboats or sailboats, this type of transducer is not recommended due to degraded performance from turbulence or excessive heel. For optimal integration, careful planning of the 9.1 m cable routing is advised to avoid electrical interference.

Durabilité

Facilité d'installation

Rapport performance / prix

Payment and security

Your payment information and data are processed securely.

GT23M-TM Transducer - Rear Mount CHIRP/ClearVü

$298.40 USD

$298.40 USD ~~$365.75 USD~~

Frequently Asked Questions

Need help? Contact us

What are the main features of the Garmin GT23M-TM transducer?

The Garmin GT23M-TM is a plastic transducer designed for transom mounting. It integrates traditional mid-band CHIRP sonar and CHIRP ClearVü technologies. This 8-pin model provides a versatile solution for detailed underwater detection, with depth and water temperature tracking capabilities.

What type of fishing is this fishfinder intended for?

The Garmin GT23M-TM fishfinder is designed specifically for inshore and offshore anglers, providing detailed underwater detection for these environments.

Which frequencies does the traditional CHIRP sonar of the GT23M-TM fishfinder use?

The traditional CHIRP sonar of the Garmin GT23M-TM fishfinder operates on a mid-band frequency range of 80 to 160 kHz.

What is the power output of the traditional CHIRP sonar in this sounder?

The Garmin GT23M-TM sounder's traditional CHIRP sonar has a power output of 600 W.

What is the maximum detection depth for the traditional CHIRP sonar?

The Garmin GT23M-TM CHIRP traditional sonar can reach a maximum depth of 549 metres (1,800 feet).

Which frequencies does the CHIRP ClearVü sonar of the GT23M-TM sounder use?

The CHIRP ClearVü sonar of the Garmin GT23M-TM sounder operates on frequencies of 260/455 kHz, specifically 245-275 kHz and 445-465 kHz.

What is the power output of the CHIRP ClearVü sonar on this sounder?

The Garmin GT23M-TM sounder’s CHIRP ClearVü sonar has a power output of 500 W.

What is the maximum detection depth for the CHIRP ClearVü sonar?

The Garmin GT23M-TM fishfinder with CHIRP ClearVü sonar can reach a maximum depth of 305 metres (1,000 feet).

What is the beam angle of the Garmin GT23M-TM CHIRP traditional sonar?

The beam angle of the Garmin GT23M-TM CHIRP traditional sonar ranges from 24° to 13°.

Does the GT23M-TM transducer measure water temperature?

Yes, the Garmin GT23M-TM transducer can track water temperature.

What is the length of the Garmin GT23M-TM transducer cable?

The Garmin GT23M-TM transducer cable is 9.1 metres (30 feet) long.

Which tools are required to install the GT23M-TM transducer?

To install the GT23M-TM transducer, you will need the following tools:

A drill and drill bits (a 4 mm (5/32 in) bit for pilot holes and a 25 mm (1 in) bit for the 8-pin cable passage)Two 13 mm hex keysA #2 Phillips screwdriverMasking tapeMarine sealant

Where should I mount the depth sounder on the transom of my boat?

For optimal performance, the depth sounder must be mounted:

As close as possible to the center of the boat.In an area of clean water (non-turbulent), away from propellers, chines, reinforcements, fittings, water discharge outlets, or anything that could create air bubbles.At least 38 cm (15 inches) from the propeller and on the opposite side to the propeller’s rotation direction to avoid propeller wash.So that the center of the bottom of the transducer is level with the lower edge of the transom and parallel to the waterline.

How to avoid interference with the sonar signal?

To reduce interference with the sonar signal, it is recommended to:

Mount the transducer away from sources of electromagnetic interference (electronic devices, engines, radar). Avoid turbulence zones created by hull features (steps, chines, ribs) or the propeller. Install the transducer away from sources of acoustic noise (other transducers, boat machinery, wind, waves, rain). If the transducer cable must cross a power cable, orient the cables at 90 degrees. If using multiple transducers, mount them at least 60 cm (24 inches) apart if they operate on the same frequency.

Which types of boats are not recommended for installing a transom-mounted depth sounder?

The GT23M-TM transducer, being a transom-mounted model, is not recommended for:

Sailboats, due to excessive rolling.Planing hull vessels.

How to test the transducer installation once mounted?

After installation, test the transducer in open water:

Turn on the chartplotter with the boat in the water.Drive the boat at low speed, then gradually increase speed while monitoring the chartplotter.If the sonar signal is lost or severely degraded, note the speed at which this occurs.Return to the speed where the signal was lost and make moderate turns in both directions while monitoring the chartplotter.If signal strength improves while turning, adjust the transducer so it extends 3 mm (1/8 in) lower below the transom.Repeat steps 2 to 4 until the degradation is eliminated. If the signal does not improve, move the transducer to another location on the transom and repeat the test.

Which hull types is the GT23M-TM transducer compatible with?

The Garmin GT23M-TM transducer, being a transom-mount transducer, is compatible with all hull materials.

Can I use multiple depth sounders on my boat at the same time?

Yes, you can run multiple depth sounders simultaneously. If you use two sounders with the same frequency, they must be mounted at least 60 cm (24 in) apart to avoid interference. Two sounders with different frequencies can operate simultaneously without this spacing restriction.

Is the GT23M-TM transducer suitable for towable boats?

Yes, the Garmin GT23M-TM transducer is suitable for towable boats. It is designed for easy installation and removal. However, it is vulnerable to external damage caused by trailers or underwater obstacles.