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GT12M-THF/GT15M-THF TRANSDUCER
INSTALLATION INSTRUCTIONS
Important Safety Information
WARNING
See the Important Safety and Product Information guide in the chartplotter, fishfinder, or sounder product box for
product warnings and other important information.
You are responsible for the safe and prudent operation of your vessel. Sonar is a tool that enhances your
awareness of the water beneath your boat. It does not relieve you of the responsibility of observing the water
around your boat as you navigate.
CAUTION
For the best possible performance and to avoid potential injury, damage to the device, or damage to your vessel,
installation by a qualified marine installer is recommended.
Failure to install and maintain this equipment in accordance with these instructions could result in damage or
injury.
To avoid possible personal injury, always wear safety goggles, ear protection, and a dust mask when drilling,
cutting, or sanding.
NOTICE
When drilling or cutting, always check what is on the opposite side of the surface to avoid damaging the vessel.
Read all installation instructions before proceeding with the installation. If you experience difficulty during the
installation, contact Garmin
®
Product Support.
To prevent interference and avoid possible overheating damage, do not install the transducer near the engine or
in the engine room.
To prevent damage to the cable and the transducer, do not use the cable to pick up or pull the transducer.
Always operate the transducer when it is submerged. Operating the transducer when it is exposed to the air may
result in damage due to overheating.
To prevent permanent damage to the surface of the transducer, do not use solvents such as mineral spirits,
acetone, Methyl Ethyl Ketone (MEK), or similar products when cleaning. Do not use a power sander or pressure
washer to clean the transducer.
July 2023
GUID-FBCD49EF-8D56-47CE-97B4-1B8840440007 v1
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Summary of Contents for Garmin GT12M-THF
- Page 1 GT12M-THF/GT15M-THF TRANSDUCER INSTALLATION INSTRUCTIONS Important Safety Information WARNING See the Important Safety and Product Information guide in the chartplotter, fishfinder, or sounder product box for product warnings and other important information. You are responsible for the safe and prudent operation of your vessel. Sonar is a tool that enhances your awareness of the water beneath your boat.
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Page 2: Software Update
The GT12M-THF transducer is made from brass, and can be installed in a fiberglass, wood, or composite-hulled vessel. You must not install this model in an aluminum or steel hull. -
Page 3: Mounting Location Considerations
Mounting Location Considerations • On outboard and sterndrive vessels , the transducer should be mounted in front of and close to the engine or engines. • On inboard vessels , the transducer should be mounted in front of and far away from the engine propeller and shaft. -
Page 4: Deadrise Angle
Deadrise Angle The deadrise angle is the measurement of the angle between a horizontal line and the outer hull at a single point. These transducers are available in a selection of pre-configured angles from 0 to 20 degrees. For optimal performance, it is critical that the transducer angle you purchase is as close as possible to the deadrise angle at the installation location. - Page 5 Preparing the Hull Preparing a Cored-Fiberglass Hull NOTICE If the core of a cored-fiberglass hull is not sealed properly, water may seep into the core and severely damage the boat. Fiberglass or casting epoxy (not included) Cylinder spacer Inner fiberglass skin Core Outer fiberglass skin 1 From outside the hull, drill a 3 mm (...
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Page 6: Installing The Transducer
Sealing the Core with Casting Epoxy To properly seal the core with casting epoxy, you must create a cylinder with an outer diameter of 73 mm (2 in.) to act as a spacer as the epoxy sets. 1 Coat a 73 mm (2 in.) cylinder with wax. -
Page 7: Installing The Transducer In A Fiberglass Hull
Transducer threads Hull nut Washer (when installing in a metal hull) Hull Thread isolator (when installing in a metal hull) Hull isolator (when installing in a metal hull) Marine sealant Installing the Transducer in a Fiberglass Hull NOTICE When installing a transducer in a fiberglass hull, avoid over-tightening the nut to prevent damaging the hull. NOTE: It is recommended that two installers complete these instructions, with one positioned outside the boat and one inside the boat. -
Page 8: Installing The Transducer In A Metal Hull
Installing the Transducer in a Metal Hull NOTE: It is recommended that two installers complete these instructions, with one positioned outside the boat and one inside the boat. 1 Before applying marine sealant, place the hull isolator and the thread isolator on the transducer. -
Page 9: Maintenance
If the transducer cable is not long enough to reach the chartplotter or sonar black box, you can purchase an extension cable from your Garmin dealer or buy.garmin.com. 1 Route and connect the transducer cable to the chartplotter or sonar black box while taking these precautions. -
Page 10: Cleaning The Transducer
Storage temperature range From -40° to 70°C (from -40° to 158°F) Diameter (threads): 70 mm (2.76 in.) Dimensions Diameter (flange): 94 mm (3.70 in.) Height: 146 mm (5.75 in.) Cable length 15 m (50 ft.) GT12M-THF Specification Measurement Housing material Bronze Weight 2.6 kg (5.7 lb.) Freshwater: 365 m (1,200 ft.) Maximum depth Saltwater: 245 m (800 ft.) - Page 11 © 2023 Garmin Ltd. or its subsidiaries Garmin ® and the Garmin logo are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. These trademarks may not be used without the express permission of Garmin. M/N: GT12M-THF / GT15M-THF 声纳探头...
- Page 12 © 2023 Garmin Ltd. or its subsidiaries support.garmin.com...