Garmin GT12M Bronze Thru-Hull Transducer - 350W Mid-Band CHIRP with Temperature Sensing
Professional Mid-Band CHIRP Sonar Performance for Midsize Vessels
The Garmin GT12M-THF Bronze Thru-Hull Transducer delivers exceptional sonar performance with 350-watt mid-band CHIRP technology, specifically designed for serious anglers and boaters operating midsize fishing and cruising vessels. This premium bronze transducer provides crystal-clear fish arches, precise structure definition, and accurate depth readings down to 1,200 feet in freshwater and 800 feet in saltwater.
Engineered with a durable bronze housing and flush-mount thru-hull design, this transducer minimizes drag while maximizing sonar sensitivity and target separation. The 0-degree tilt configuration makes it ideal for vessels with hull deadrise angles from 0 to 7 degrees, ensuring optimal beam orientation and superior underwater visibility.
Advanced CHIRP Sonar Technology
350-Watt Mid-Band CHIRP
High-definition mid-band CHIRP sonar operates across 85-165 kHz frequency range, providing excellent target separation and crystal-clear fish arches for superior fishing success.
Bronze Thru-Hull Construction
Durable bronze housing and stem provide corrosion resistance and flush-mount installation for minimal drag and optimal hydrodynamic performance.
Dual-Function Capabilities
Combines high-performance depth measurement with fast-response water temperature sensing for comprehensive underwater information.
Auto-ID Technology
Plug-and-play operation with Garmin's auto-identification technology automatically configures compatible chartplotters for immediate operation.
Detailed Technical Specifications
| Model Number: | GT12M-THF (010-02867-00) |
| Power Output: | 350 watts |
| Frequency Range: | 85-165 kHz (Mid-Band CHIRP) |
| Beamwidth: | 16-24 degrees |
| Maximum Depth: | 1,200 ft freshwater / 800 ft saltwater |
| Housing Material: | Bronze with anti-corrosion treatment |
| Installation Type: | Thru-hull flush mount |
| Tilt Angle: | 0 degree (supports 0-7° deadrise) |
| Cable Length: | 50 feet |
| Connector: | 8-pin transducer connector |
| Temperature Sensor: | Fast-response thermistor |
| Hull Compatibility: | Fiberglass, composite, wood |
Superior Sonar Performance Features
High-Definition Fish Arches
Mid-band CHIRP technology delivers crisp, well-defined fish arches that make it easy to distinguish between small baitfish and larger target species. Enhanced target separation helps identify individual fish within schools.
Excellent Structure Definition
Superior sonar sensitivity and low noise performance provide clear definition of underwater structures, bottom composition, and habitat features critical for successful fishing.
Wide Coverage Area
The 16-24 degree beamwidth provides excellent coverage while maintaining target resolution, perfect for scanning large areas and locating fish-holding structure.
Accurate Depth Readings
Precise depth measurement capabilities ensure accurate navigation and fishing in varying water conditions, with consistent performance across the entire depth range.
Installation Requirements & Considerations
Hull Compatibility
- Deadrise Angles: 0-7 degrees (0-degree tilt version)
- Hull Materials: Fiberglass, composite, and wood construction
- Installation Method: Thru-hull flush mounting for minimal drag
- Hull Thickness: Compatible with standard recreational boat hull thicknesses
Installation Components Included
- GT12M-THF transducer with bronze housing
- Jam nut for secure mounting
- Sealing washer
- Complete installation documentation
- 50-foot marine-grade cable with 8-pin connector
Professional Installation Recommended
While experienced boat owners can perform the installation, professional installation is recommended to ensure proper hull preparation, sealant application, and optimal transducer placement for best performance.
Chartplotter Compatibility
The GT12M-THF is compatible with a wide range of Garmin chartplotters and fishfinders featuring 8-pin transducer connections and CHIRP sonar capability:
Compatible Garmin Units
- ECHOMAP Ultra series
- ECHOMAP UHD series
- GPSMAP series with sonar capability
- Garmin fishfinder combos with CHIRP support
- Units supporting mid-band CHIRP frequencies (85-165 kHz)
Auto-ID Technology: Garmin's automatic transducer identification eliminates manual configuration - simply connect and start fishing with optimized sonar settings.
Optimal Marine Applications
Sport Fishing
Exceptional fish-finding performance for offshore and inshore angling. Clear baitfish detection and structure identification for productive fishing trips.
Cruising & Navigation
Reliable depth measurement and bottom mapping for safe navigation in unfamiliar waters. Temperature sensing aids in route planning.
Commercial Fishing
Professional-grade performance for charter boats and commercial fishing operations requiring dependable fish-finding capabilities.
Tournament Fishing
Competitive advantage with superior target separation and structure definition essential for tournament success.
Maintenance & Reliability
Low Maintenance Design
- Bronze housing resists marine corrosion and biofouling
- No moving parts for long-term reliability
- Sealed construction prevents water intrusion
- Marine-grade cable and connections
Maintenance Tips
- Periodic inspection of thru-hull fitting and sealant
- Gentle cleaning of transducer face to remove marine growth
- Check cable connections for corrosion annually
- Proper winterization in freezing climates
Frequently Asked Questions
What's the difference between this 0-degree tilt and other tilt options?
The 0-degree tilt is designed for boats with hull deadrise angles from 0-7 degrees. Other tilt options (12° and 20°) accommodate different hull deadrise angles. Proper tilt selection ensures optimal sonar beam orientation perpendicular to the water surface.
Can this transducer be used in both fresh and salt water?
Yes, the GT12M-THF is designed for both freshwater and saltwater use. Maximum depth performance is 1,200 feet in freshwater and 800 feet in saltwater due to signal attenuation differences.
What tools are needed for installation?
Installation requires a hole saw matching the transducer diameter, drill, marine sealant, and basic hand tools. Professional installation is recommended for optimal results and warranty compliance.
Does this transducer include speed measurement?
No, this model includes depth and temperature sensing only. Speed measurement would require a separate speed sensor or transducer with integrated speed paddle wheel.
How does CHIRP technology improve fish detection?
CHIRP technology transmits a continuous sweep of frequencies (85-165 kHz) rather than a single frequency, providing better target separation, clearer fish arches, and improved bottom definition compared to traditional sonar.
Is this transducer compatible with non-Garmin units?
This transducer is specifically designed for Garmin chartplotters and fishfinders with 8-pin CHIRP capability. Compatibility with other brands may require adapters and may not provide optimal performance.
Upgrade your fishing and navigation capabilities with the Garmin GT12M-THF Bronze Thru-Hull Transducer. This professional-grade transducer delivers the high-definition sonar performance and reliability demanded by serious mariners, ensuring you have the underwater visibility needed for successful fishing and safe navigation.