GT24UHD-TM sonar – aft display UHD ClearVü

The Garmin GT24UHD-TM transducer is designed to be mounted on the transom of your boat or on a trolling motor. Mounting hardware for both options is typically included.

For transom installation, you will need the following tools:

A #2 Phillips screwdriverA drillBits: 4 mm (5/32 in), 3.2 mm (1/8 in), and 25 mm (1 in)Masking tapeMarine sealant

Transducers mounted on the transom like the GT24UHD-TM are compatible with all hull materials. However, for optimal performance, it is not recommended for sailboats due to excessive heel, nor for vessels with stepped hulls.

To reduce interference with the depth sounder signal, it is recommended to mount it away from common sources of interference. These include:

Propellers, to avoid propeller wash.Electronic devices such as engines, radar, and audio equipment.Hull features (chine lines, strakes, ribs) that can create turbulence.Other transducers (mount them at least 60 cm apart if they operate on the same frequency).The ship's machinery, wind, waves, and rain.It is also advisable to ensure proper grounding of the sonar device and other equipment.

Transducers mounted on the transom like the GT24UHD-TM perform best at speeds below 34 mph (approximately 55 km/h) and when installed away from turbulence.

Yes, if your boat spends a significant amount of time in the water, it is recommended to apply water-based antifouling paint to the transducer and mounting hardware to prevent marine growth. Before application, lightly sand the transducer and hardware with fine-grit abrasive pads, then clean them with isopropyl alcohol.

Warning: Do not use acetone or acetone-based products on the transducer, as this will damage the plastic housing.

The depth sounder must be mounted as close as possible to the centerline of the transom, but at least 38 cm (15 inches) away from the propeller. It is crucial to mount it away from the propeller wash to avoid interference and potential damage to the depth sounder and the propeller.

If your propeller rotates clockwise when the boat is moving forward, it creates turbulence on the port side (left). In this case, you should install the depth sounder on the starboard side (right) of the boat, facing forward.

If your propeller turns counterclockwise when the boat is moving forward, it creates turbulence on the starboard (right) side. In this case, you should mount the depth sounder on the port (left) side of the boat, facing forward.

The transducer should protrude by approximately 3.5 mm (0.125 in) under a fiberglass hull or 10 mm (0.375 in) under an aluminum hull. The goal is for it to be parallel to the waterline and in direct, unobstructed contact with smooth water for optimal performance.

No, it is strongly discouraged to cut the transducer cable. Cutting the transducer cables voids the product warranty.

Route the depth sounder cable away from ignition wires, batteries and wiring harnesses, trolling motor batteries and wiring, and high-energy wires such as those from radar, audio amplifier, and autopilot pump. If the depth sounder cable must cross a power cable, cross at 90 degrees.

After installation, test the transducer in open water, free of obstacles. Power on the chartplotter and drive the boat at low speed, then gradually increase it. Observe the chartplotter. If the sonar signal is suddenly lost or severely degraded, note the speed at which this occurs. Return to that speed and perform moderate turns in both directions while observing the chartplotter. If the signal improves when turning, adjust the transducer so it protrudes 3 mm (1/8 in) further below the transom. Repeat until the degradation is eliminated. If the signal does not improve, move the transducer to another location on the transom and repeat the test.

Yes, you must update the software of your Garmin chartplotter when installing this depth sounder. For update instructions, refer to your chartplotter's user manual.

Yes, the GT24UHD-TM transducer is designed to be installed on a trolling motor. The kit includes the necessary mounting hardware for this configuration.

To mount the transducer on the trolling motor, insert the hose clamps through the transducer bracket slots until equal lengths protrude on both sides. Place the bracket against the trolling motor body with the narrow end of the transducer pointing away from the propeller. Secure the hose clamps around the trolling motor body and tighten them. Position the transducer so that it is parallel to the bottom when in use. Use waterproof tape (not included) to secure the transducer cable to the trolling motor shaft, avoiding pinching or excessive bending.

Yes, the transducer is supplied with a mounting template in the product box. It is recommended to use this supplied template rather than printing your own, as an incorrect printout could result in an incorrectly sized cutout on your boat's mounting surface.

The "UHD" in GT24UHD-TM stands for "Ultra High Definition". This indicates that the transducer delivers highly detailed sonar images, providing exceptional clarity below and to the sides of the boat, particularly with Garmin’s ClearVü technology.

Yes, transducers mounted on the transom like the GT24UHD-TM are suitable for towed boats, especially when used with an optional folding bracket. However, they are vulnerable to external damage from trailers or underwater obstructions, so caution is advised.

The Garmin GT24UHD-TM transducer is primarily designed for mounting on the transom of your boat. It is attached to the outside of the transom using a bracket and screws.

Additionally, this transducer can also be installed on a trolling motor. For this, it is secured to the motor body using hose clamps (not included for mounting on an electric motor).

For both mounting types, it is crucial to follow the installation instructions to ensure optimal performance and avoid interference.