Garmin GT51M-TH
Garmin GT51M-TH
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Garmin GT51M-TH
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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 GT51M-TH: Mid-Band CHIRP & Scanning Transducer (Thru-Hull)
The Garmin GT51M-TH is the rugged **thru-hull version** of Garmin’s high-power, all-in-one transducer, designed for permanent installation on coastal and offshore vessels. With a durable stainless steel stem, it features powerful **Mid-Band CHIRP Traditional Sonar (600 W)** and high-resolution **CHIRP ClearVü™ and SideVü™ scanning sonar (500 W per element)**. It consistently displays clear fish arches and superior target separation, optimized specifically for **rough sea conditions** and deep traditional sonar down to **1,800 feet**.
STAINLESS STEEL DURABILITY & DEEPWATER CLARITY
The thru-hull mounting provides enhanced performance and stability at speed compared to transom mounts. This transducer is engineered for precise fishfinding in challenging environments.
KEY SONAR & COVERAGE FEATURES
- Deep Traditional Sonar: 600 W power for depths up to **1,800 feet**, utilizing Mid-Band CHIRP (80-160 kHz).
- CHIRP Scanning: ClearVü™ up to **1,000 feet** and SideVü™ up to **750 feet**, operating at 260/455 kHz.
- Thru-Hull Kit: Includes stainless steel stem, fairing block, and installation hardware. Designed for hulls with **less than 5 degrees of deadrise**.
- Temperature Sensor: Features a built-in fast-response temperature sensor for accurate water temperature readings.
INSTALLATION AND CONNECTIVITY
The GT51M-TH is a high-performance transducer built for lasting, below-waterline installation.
- **12-Pin Connector:** Uses the standard 12-pin connector for simultaneous output of all three sonar technologies.
- **Cable Length:** Includes a 5-foot cable plus a **30-foot extension cable** for easy routing through the vessel.
- **Installation Note:** The fairing block is designed to correct transducer beam angles for optimal performance on hulls up to 5° deadrise.
Inverell Boating Centre Expert Note:
The GT51M-TH is the preferred choice for permanent installation on fiberglass or wood hulls, offering increased durability and less turbulence than transom-mounted units. Due to the requirement for hull penetration and precise alignment, **professional marine installation is highly recommended**. It requires a compatible Chartplotter with a 12-pin port and built-in CHIRP/scanning capability.
Specification in detail
Specification in detail
General & Physical
PART NUMBER: 010-01966-10
INSTALLATION: Thru-Hull (Stainless Steel Stem)
CABLE LENGTH: 5 ft + 30 ft extension cable
SUPPORTED DEADRISE: Up to 5° deadrise
INCLUDES: Fairing block, isolation plate, bushings, mounting hardware
Sonar Capabilities
NUMBER OF PINS: 12-pin
TRADITIONAL SONAR: CHIRP Mid-band (80-160 kHz)
TRADITIONAL POWER: 600 W
MAXIMUM DEPTH (TRADITIONAL): 1,800 ft (548 m)
SCANNING SONAR: CHIRP ClearVü™ and SideVü™
SCANNING POWER: 500 W per element
MAXIMUM DEPTH (CLEARVÜ): 1,000 ft (304 m)
MAXIMUM DEPTH (SIDEVÜ): 750 ft (228 m)
Inverell Boating Centre Technical Summary: The GT51M-TH provides comprehensive sonar coverage with high power (600W/500W). Its thru-hull mounting is designed for rough offshore conditions, and the Mid-band CHIRP frequency is optimized for deep water, offering reliable returns down to 1,800 feet.
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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