Garmin GT20-TM
Garmin GT20-TM
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Garmin GT20-TM
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“I upgraded to the Garmin GT56UHD and the clarity is unbelievable. You can literally see fish moving around structure. Hard Rig Marine helped me pick the right setup and it’s been spot on since day one.”
Michael R. — Cairns, QLD -
“I’m not a tech person, but the team made it super easy to install my GT54UHD transducer. Works perfectly with my ECHOMAP — I’ve never had sonar this clear in the estuary before!”
Jenny L. — Mandurah, WA -
“The Airmar B175M changed my whole deep drop setup. Way better definition and stability compared to my old transducer. You get what you pay for — and these guys know their stuff.”
Ben T. — Newcastle, NSW
GARMIN GT20-TM: 8-pin Transom Mount with Traditional & ClearVü™ Sonar
The Garmin GT20-TM is an essential all-in-one transducer for shallow-water anglers, featuring both traditional sonar and **CHIRP ClearVü™ scanning sonar** in a single unit. This transom or trolling motor mounted transducer consistently displays clear fish arches and crisp pictures of objects and structure below your boat. With **500 W** of power, it provides reliable performance down to **1,900 feet (traditional)** and **750 feet (ClearVü)**.
DUAL SONAR PERFORMANCE & RANGE
The GT20-TM uses dual-frequency traditional sonar combined with high-frequency scanning to deliver superior detail in coastal and inland fishing environments.
KEY SONAR & COVERAGE FEATURES
- Traditional Sonar: Operates at 77/200 kHz frequencies, providing up to 1,900 feet of traditional depth capability.
- ClearVü™ Scanning Sonar: CHIRP 455/800 kHz scanning provides a nearly photographic view of structure and fish directly below your boat, with depths up to 750 feet.
- Dual Power Rating: Provides a stable 500 W of power for both Traditional and ClearVü elements.
- Installation: Includes mounting hardware for both Transom and Trolling Motor installation.
CONNECTIVITY & RELIABILITY
The GT20-TM is a reliable, entry-level transducer that integrates seamlessly with 8-pin compatible Garmin units.
- **8-Pin Connector:** Uses the dedicated 8-pin connector for a simple, plug-and-play installation.
- **Cable Length:** Includes a 20-foot transducer cable with a built-in fast-response temperature sensor.
- **Supported Angles:** Supports transom angles between 0°–70° degrees for optimal sonar operation.
Inverell Boating Centre Expert Note:
The GT20-TM is an excellent value option for shallow-water depth, providing 500W performance through a single 8-pin connection. Ensure your Chartplotter (e.g., compatible echoMAP™ or STRIKER™ Plus models) has a corresponding 8-pin port to utilize both Traditional and ClearVü sonar features.
Specification in detail
Specification in detail
General & Physical
PART NUMBER: 010-01960-01
CABLE LENGTH: 20 ft (6.1 m)
INSTALLATION: Transom or Trolling Motor Mount (Hardware Included)
SUPPORTED TRANSOM ANGLES: 0°–70° degree transom
Sonar Capabilities
NUMBER OF PINS: 8-pin
TRADITIONAL SONAR: Traditional 77/200 kHz
TRADITIONAL POWER: 500 W
MAXIMUM DEPTH (TRADITIONAL): 1,900 ft (579 m)
SCANNING SONAR: ClearVü CHIRP 455 kHz (435-475 kHz) & 800 kHz (800-840 kHz)
SCANNING POWER: 500 W
MAXIMUM DEPTH (CLEARVÜ): 750 ft (228 m)
DEPTH/SPEED/TEMPERATURE: Depth and Temperature
Inverell Boating Centre Technical Summary: The GT20-TM is a highly versatile 8-pin transducer, transmitting 500W of power for both traditional and scanning sonar. It supports traditional sonar depths up to 1,900 ft and ClearVü clarity up to 750 ft, making it an excellent, low-cost option for shallow to mid-depth water applications.
Warranty / Availability of Repair Facilities & Parts
Warranty / Availability of Repair Facilities & Parts
AU Warranty / Availability of Repair Facilities & Parts
Garmin Warranty / Availability of Repair Facilities & Parts
On this page, Garmin customers in Australia will find detailed warranty information; information regarding availability of repair facilities and parts including for out-of-warranty service; other important details regarding repair or replacement of a Garmin product; and how to contact Inverell Boating Centre for further information.
On this page
- Limited Warranty
- Availability of Repair Facilities & Parts (Out of Warranty)
- Repair or Replacement of a Garmin Product
- Additional Resources
- Contact for Further Information
Limited Warranty
This warranty is provided by Garmin Australasia Pty Ltd.
Application of Australian Consumer Guarantees
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if they fail to be of acceptable quality and the failure does not amount to a major failure.
The benefits under this Limited Warranty are in addition to other rights and remedies under applicable law. Phone: 0417 159 205.
One-Year Consumer Products Limited Warranty
Non-aviation products are warranted to be free from defects in materials or workmanship for one year from the date of purchase. Within this period, Garmin Australasia will, at its sole option, repair or replace any components that fail in normal use at no charge for parts or labour (customer responsible for transportation).
Warranty Exclusions
- Cosmetic damage such as scratches, nicks, and dents.
- Consumable parts (batteries, etc.) unless damage occurs due to defects in materials or workmanship.
- Damage from accident, abuse, misuse, water, fire, or external causes.
- Service by non-authorised providers.
- Modifications or altered units without written permission.
- Damage caused by non-Garmin cables or accessories.
Garmin reserves the right to refuse warranty claims for products obtained or used in contravention of local laws. Map accuracy and completeness are not guaranteed.
Warranty Process
- Contact Inverell Boating Centre Support to request an RMA number.
Email: inverellboatingcentre.cwa@gmail.com
Phone: 0417 159 205
Provide your unit serial number, return address, and contact number.
- Ship the unit with RMA number to Garmin or Inverell Boating Centre.
INVERELL BOATING CENTRE
Attn: Warranty / Returns:
10a Swanbrook Rd,
Inverell NSW 2360,
Australia
Availability of Repair Facilities & Parts (Out of Warranty)
Garmin products include complex integrated components. Repairs of parts such as cracked screens or integrated bands may not be possible outside Garmin factory conditions. Therefore, facilities or spare parts may not always be available for repair of such components.
Where an out-of-warranty service is required, Garmin Australasia or INVERELL BOATING CENTRE may offer to sell a replacement unit or Garmin Refurbished product. This applies only to out-of-warranty service and not to consumer guarantees under the Australian Consumer Law.
Repair or Replacement of a Garmin Product
Australian Consumer Law Notice:
- Repair or replacement of goods capable of retaining user data may result in loss of that data.
- Goods presented for repair may be replaced with refurbished goods of the same type rather than repaired. Refurbished parts may be used to repair goods.
Additional Resources
- Parallel imports: accc.gov.au/buying-parallel-imports
- Proof of purchase: accc.gov.au/receipts-proof-of-purchase
- Identifying genuine business: accc.gov.au/identifying-a-genuine-business
Contact for Further Information
For all warranty or out-of-warranty enquiries, please contact:
INVERELL BOATING CENTRE
www.inverellboatingcentre.com
10a Swanbrook Rd, Inverell NSW 2360, Australia
Phone: 0417 159 205

Verified Customer Feedback
Excellent
4.8
/ 5
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“I run dual Garmin units and the thru-hull transducer from Hard Rig gives me crystal bottom lock even at 25 knots. Couldn’t be happier with the setup and advice.”
Shaun K. — Townsville, QLD
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“I was worried about installing a thru-hull model, but the support from Hard Rig was awesome. The Airmar B60 works flawlessly on my fibreglass hull — depth readings are spot on.”
Emily P. — Hobart, TAS
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“Just fitted a GT15M-TM to my tinnie and I’m blown away by the detail. Picks up structure I never knew was there. Shipping was fast and everything came ready to install.”
Darren F. — Perth, WA
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