GT30-TM ClearVü / SideVü depth sounder with rear display (12-pin)

The Garmin GT30-TM transducer uses ClearVü™ and SideVü™ sonar technologies. These technologies provide detailed images of the seabed, underwater structures, and fish, particularly suited for shallow-water fishing.

The GT30-TM transducer has a transmission power of 500 W per element. It operates on CHIRP frequencies of 455 kHz (range 425–485 kHz) and 800 kHz (range 790–850 kHz).

In ClearVü mode, the Garmin GT30-TM transducer provides a maximum depth of 228 meters. This makes it effective for detailed bottom imaging in shallow waters.

In SideVü mode, the GT30-TM transducer provides a lateral range of 152 meters on each side of the boat, offering an extended view of structures and fish on the sides.

Yes, the Garmin GT30-TM transducer includes a fast-response temperature sensor, providing accurate water temperature data.

The Garmin GT30-TM transducer is a transom-mount (TM) transducer. It is mounted on the outside of the boat’s transom for easy installation and removal.

The Garmin GT30-TM transducer dimensions are 197.93 mm (L) x 38.21 mm (W) x 23.14 mm (H), approximately 7.8 x 1.5 x 0.9 inches.

The beam angles are as follows:

ClearVü: 1.4°x53° at 455 kHz and 0.8°x30° at 800 kHz.
SideVü: 1.1°x53° at 455 kHz and 0.7°x30° at 800 kHz.
These narrow beams ensure precise image resolution.

The GT30-TM transducer is compatible with Garmin displays that support ClearVü™ and SideVü™ technologies. It features a 12-pin connector.

The GT30-TM transducer is equipped with a 12-pin connector. The transducer cable has a length of 6 meters.

For optimal performance, the transducer must be installed:

Parallel to the waterline.As close as possible to the centerline of the boat.Away from seams, stiffeners, fittings, water intakes or discharges, or any element that could create bubbles or turbulence.At least 38 cm (15 in) from the propeller on boats with outboard or inboard/outboard engines.On the side opposite to the turbulence generated by the propeller (starboard side if the propeller rotates clockwise, port side if it rotates counterclockwise).

To reduce interference:

Electromagnetic Interference (EMI): Ensure proper grounding of the sonar and other equipment. Route the transducer cable away from power cables and electromagnetic sources (engines, radar, etc.). If the cable must cross a power cable, do so at a 90-degree angle.

Turbulence Interference: Mount the transducer as far as possible from submerged equipment or hull features (chine, strakes) that may agitate the water.

Acoustic Interference: Avoid mounting the transducer behind through-hull fittings, water intake/outlet ports, or hull irregularities. If using multiple transducers, space them at least 60 cm (24 in) apart.

Yes, it is important to consider the propeller's rotation direction. The propeller creates a current known as "prop wash" which can interfere with the depth sounder's signal. If the propeller rotates clockwise, it generates turbulence on the port side; you should mount the transducer on the starboard side. If it rotates counterclockwise, it generates turbulence on the starboard side; you should mount the transducer on the port side.

If the transducer is to remain in the water for long periods, it is recommended to prepare it to prevent marine growth:

Lightly sand the transducer and mounting hardware with fine-grit abrasive pad.
Clean the transducer and mounting hardware with isopropyl alcohol.
Apply water-based antifouling paint to the transducer and mounting hardware.
Warning: Never use acetone or acetone-based products, as this will damage the transducer’s plastic housing.

For installing the GT30-TM transducer, you will need the following tools:

A drill and drill bits.A Phillips screwdriver size #2.Masking tape.Marine sealant.

For mounting bracket pilot holes, use a 4 mm (5/32 in) drill bit and drill to a depth of approximately 18 mm (7/10 in). If you need to route the cable through the back panel, for a 12-pin cable such as that on the GT30-TM, use a 25 mm (1 in) drill bit for the pass-through hole.

To test the installation:

Put the boat in the water and power on the display. Drive the boat at low speed. If the sonar is working correctly, gradually increase speed while monitoring the screen. If the sonar signal is lost or significantly degraded at a certain speed, note that speed. Return to that speed and perform moderate turns in both directions. If the signal improves while turning, adjust the transducer so it extends approximately 3 mm (1/8 in) deeper in the water. Make adjustments in small increments to avoid placing the transducer too deep, which could affect boat performance or risk damaging the transducer.

Yes, transom-mount transducers such as the GT30-TM work with any hull material. However, they are not recommended for sailboats due to excessive heel or for vessels with deep-V hulls.

Yes, it is recommended to update the software of your Garmin display when installing this transducer. You can do this via the ActiveCaptain app if your display has Wi-Fi capability, or via an SD card and a computer if it does not.