GT22HW-TM CHIRP / ClearVü depth sounder with 8-pin transom mount

The Garmin GT22HW-TM transducer integrates two main sonar technologies:

Traditional CHIRP sonar (wide and high frequency)CHIRP ClearVü sonar

The CHIRP sonar of the GT22HW-TM depth sounder operates on a wide high CHIRP frequency range from 150 to 240 kHz, with a power output of 250 W.

The maximum depth this transducer can reach is:

244 metres (800 feet) in freshwater for traditional CHIRP sonar. 152 metres (500 feet) in freshwater for CHIRP ClearVü sonar.

Yes, the Garmin GT22HW-TM transducer is equipped with an integrated fast-response water temperature sensor.

The GT22HW-TM transducer is made of plastic, making it suitable for mounting on the transom or an electric motor.

The Garmin GT22HW-TM transducer uses an 8-pin connector to connect to your display.

To install the transducer on a transom, 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

This equipment should be installed by a qualified marine technician. This ensures optimal performance and helps prevent damage to your boat.

To prevent marine growth during prolonged water exposure, you must:

Lightly sand the transducer and mounting hardware with fine abrasive pad.
Wipe 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 on the transducer, as this will damage its plastic housing.

For optimal performance, the transducer must be mounted:

Parallel to the waterline.At least 38 cm (15 in) from the propeller.As close as possible to the centerline of the transom.In a clean, non-turbulent water area, away from seams, fittings, water intakes or discharges, and anything that could create air bubbles.

To ensure optimal performance with minimal noise and interference, route the transducer cable away from:

Ignition wiresBatteries and service wiringBatteries and trolling motor wiringHigh-energy wires (radar, audio amplifier, autopilot pump)If the transducer cable must cross a power cable, try to orient them at 90 degrees.

If your depth sounder is ejecting an excessive amount of water, review the mounting considerations. Adjust the transducer position if needed to eliminate splashing, ensuring it is properly aligned and fully submerged.

Yes, the Garmin GT22HW-TM transducer is designed to be mounted on a transom or on an electric motor.

No, it is strongly advised against cutting the cables connected to the transducer. Cutting the transducer cables will void your warranty.

To avoid interference from the propeller wash:

If your propeller rotates clockwise (viewed from the stern), mount the transducer on the starboard (right) side. If your propeller rotates counterclockwise, mount the transducer on the port (left) side. The transducer must be mounted at least 38 cm (15 in) from the propeller.

To reduce electromagnetic interference (EMI):

Ensure proper grounding of your sonar and other equipment. You can install a ferrite bead on the transducer cable. Route the transducer cable away from other power cables. If the transducer cable must cross a power cable, orient the cables at 90 degrees. You can apply EMI tape to shield cables.

To test the installation:

Put the boat in the water and power on the display. Drive the boat at low speed, then gradually increase while monitoring the display. If the sonar signal is lost or degraded, note the speed. Return to this speed and make moderate turns in both directions. If the signal improves while turning, adjust the transducer so it extends 3 mm (1/8 in) deeper 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. Important: The transducer must be submerged to function properly. Check for leaks around the screw holes below the waterline before leaving the boat in the water.

The GT22HW-TM transducer, designed for transom mounting, is compatible with all hull materials, including fiberglass and aluminum.

Yes, you must update the software of your Garmin display when installing this transducer to ensure compatibility and optimal performance. Refer to your display’s user manual for update instructions.