GT24UHD-TM Sonar - UHD ClearVü Rear Mount

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 installation on the transom, you will need the following tools:

A Phillips screwdriver size #2A 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 (space them at least 60 cm apart if they operate on the same frequency).The vessel’s machinery, wind, waves, and rain.It is also advisable to ensure proper grounding of the sonar unit 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 period 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 abrasive padding, then clean them with isopropyl alcohol.

Caution: 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) from the propeller. It is critical to mount it away from the propeller wash to avoid interference and potential damage to both the depth sounder and the propeller.

If your propeller turns clockwise when the boat is moving forward, it creates turbulence on the port (left) side. In this case, you should mount the depth sounder on the starboard (right) side 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 must extend approximately 3.5 mm (0.125 in) below a fiberglass hull or 10 mm (0.375 in) below 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. Cutting the transducer cable voids the product warranty.

Route the depth sounder cable away from ignition wires, batteries and service wiring, trolling motor batteries and wiring, and high-energy wires such as those for radar, audio amplifier and autopilot pump. If the depth sounder cable must cross a power cable, orient the cables 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. Monitor 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, it is necessary to update the software of your Garmin chartplotter when you install this depth sounder. For update instructions, refer to your chartplotter's user manual.

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

To mount the depth sounder on the trolling motor, insert the hose clamps through the sounder bracket slots until equal lengths protrude on both sides. Place the bracket against the trolling motor body, with the narrow end of the sounder pointing away from the propeller. Secure the hose clamps around the trolling motor body and tighten them. Position the sounder so it is parallel to the bottom when in use. Use waterproof tape (not included) to secure the sounder 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 the 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 the GT24UHD-TM name stands for "Ultra High Definition." This indicates that the transducer provides highly detailed sonar images, offering exceptional clarity below and to the sides of the boat, particularly with Garmin’s ClearVü technologies.

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 installation on the transom of your boat. It is mounted externally on 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 electric motor installation).

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