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Garmin GT21 Thru-Hull Transducer

Product Code: GARGT21

The Garmin GT21 thru-hull transducer is perfect for the coastal and offshore fishermen who want traditional sonar and CHIRP ClearVü scanning sonar with a stainless steel stem.

Once connected to your compatible Garmin Chartplotter or Fishfinder the 8-pin thru-hull mounted transducer consistently displays clear and crisp fish arches with superior target separation as well as clear definition of structure below the boat.

Garmin part number: 010-01962-10

Compatibility: Compatible with selected Garmin chartplotter/fishfinders models, please complete our online form on the Garmin Transducers Buyer's Guide page.

Garmin GT21 Thru-Hull Transducer - £439.99

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Garmin GT21 Thru-Hull

The Garmin GT21 thru-hull transducer is perfect for the coastal and offshore fishermen who want traditional sonar and CHIRP ClearVü scanning sonar with a stainless steel stem.

Once connected to your compatible Garmin Chartplotter or Fishfinder the pair of 8-pin thru-hull mounted transducers consistently displays fish arches as well as clear pictures of objects, structure and fish that pass below and to each side of your boat.

The CHIRP ClearVü element has a power rating of 500 W and operating frequencies of 260/455 kHz. The traditional sonar has a power rating of 600 W and operating frequencies of 50/200 kHz. It includes a built-in fast-response temperature sensor. For hull deadrises less than 25 degrees.

GT21-TH includes an 8-pin transducer with stainless steel stem, fairing block, isolation plate and bushings, mounting hardware and installation instructions. Follow the instructions carefully to avoid damaging your boat.

8-pin Transducer Connectivity

The Garmin GT21 features an 8-pin connection. Depending upon the Garmin chartplotter or fishfinder you intend to connect the GT21 thru-hull transducer to you may need to additionally buy one of the following Garmin adaptor cables to complete the installation:

‣Garmin echoMAP, GPSMAP, STRIKER 8-pin Transducer to 12-pin Sounder Adapter Cable with XID

‣Garmin echo, echoMAP, STRIKER 8-pin Transducer to 4-pin Sounder Adapter Cable

Key Features

‣Stainless Steel thru-hull transducer
‣8-pin thru-hull transducer
‣Traditional sonar (50/200kHz)
‣ClearVu CHIRP 260 kHz (245-275 kHz) & 455 kHz (445-465 kHz)
‣Traditional Power 600W
‣CHIRP ClearVu Power 500W
‣Genuine Garmin accessory

What's in the box?

‣8-pin transducer with stainless steel stem
‣Fairing block
‣Isolation plate
‣Bushings
‣Installation instructions

What is the Garmin GT21 compatible with?

The genuine Garmin GT21 is thru-hull transducer and is compatible with selected Garmin chartplotter/fishfinders models. Unless you are sure it is compatible with your Garmin marine GPS device please complete our online form on the Garmin Transducers Buyer's Guide page.

Once you have completed the online form with details of the Garmin marine device you own or intend to use your Garmin transducer with, we will then be able to confirm the exact transducer best suited to your needs.

The Garmin Transducer online form also asks: What material is your boat's hull made from? How is your motor mounted? Which transducer mounting style would you like to use? What is the deadrise angle of the boat's hull where the transducer will be mounted? What sonar view(s) do you require?

View the Garmin Transducer Buyer's Guide

Garmin GT21 Technical Specification

‣Frequency: Traditional: (50 to 200kHz), ClearVü CHIRP 260kHz (245-275kHz) & 455kHz (445-465kHz)
‣Power: Traditional: 600 watts, ClearVu: 500 watts
‣Beam width (°) LF/HF (-3dB): 40° to 10°, ClearVu (2.0x51 @ 260kHz) & (1.4x29 @ 455kHz)
‣Maximum depth: Traditional: 1,500 foot, ClearVu: 1,000 foot
‣Depth/Speed/Temperature:Depth only
‣Number of pins: 8-pin
‣Cable length: 30 foot
‣Garmin Thru-Hull Transducer manual

Manual requires Adobe Acrobat Reader
Download a free copy here

This product is a sophisticated electronic device which requires that you read, understand, and act upon the information given in the instruction manual (usually available via the above 'manual' link).

Why buy from us?

We are official Authorised Internet Retailers for Garmin. We sell genuine Garmin products, accessories and maps. We purchase from assigned Garmin UK distributors. We do not buy on the grey market and we do not sell counterfeit products. You can rest assured that by purchasing from ActiveGPS you will receive the full support of Garmin.

This page was last updated on: 14th November 2024