Description
Garmin GT20-TM Transducer | Boat Supply Store
For anglers targeting structure and baitfish, this 8-pin transom mount transducer provides a dual sonar solution essential for precise underwater reconnaissance. It integrates high-frequency DownVü imaging at 455/800kHz, capable of scanning down to 750 feet, with traditional 77/200kHz sonar reaching depths of 1,900 feet for wider fish detection. The included 20 ft cable and fast-response temperature sensor offer comprehensive data acquisition for optimal fishing strategies in coastal waters or inland lakes.
Key Features
- All-in-one 8-pin design consolidates dual sonar capabilities.
- Detailed structure scanning via DownVü 500W (CHIRP 455/800kHz).
- Wider fish detection with traditional 500W (77/200kHz) sonar.
- Built-in temperature sensor for real-time water condition monitoring.
- Extended reach with a 20 ft transducer cable.
- Versatile mounting options with included transom and trolling motor hardware.
- Enhanced clarity for identifying submerged objects and fish schools.
- Direct integration with compatible Garmin fishfinder units.
Specifications
| Product Specifications | |
|---|---|
| Connector Type | 8-Pin |
| Power Output | 500W |
| DownVü Frequency | 455/800 kHz (CHIRP) |
| Traditional Sonar Frequency | 77/200 kHz |
| Temperature Sensor | Yes |
| Cable Length | 20 ft |
| DownVü Depth Range | 750 ft |
| Traditional Depth Range | 1,900 ft |
| Mounting Type | Transom/Trolling Motor |
Who This Is For
Anglers and boaters seeking detailed underwater imagery for structure and fish detection will benefit from this dual-function transducer. It is ideal for those prioritizing ease of installation and compatibility with Garmin fishfinders, particularly on smaller to mid-sized vessels.
How It Compares
| Feature | Garmin GT20-TM Transducer | Airmar TM275LH |
|---|---|---|
| DownVü Frequency | 455/800 kHz (CHIRP) | 42-65 kHz / 130-210 kHz |
| Traditional Sonar Frequency | 77/200 kHz | 130-210 kHz |
| Power Output | 500W | 600W |
| Temperature Sensor | Yes | Yes |
| Connector Type | 8-Pin | 12-Pin |
| Depth Range (Traditional) | 1,900 ft | Up to 5,000 ft |
| Depth Range (DownVü) | 750 ft | Typically less capable |
Common Concerns Answered
How critical is precise transom angle adjustment for optimal DownVü clarity?
Achieving optimal DownVü clarity necessitates precise transom angle adjustment. Careful attention during installation to align the transducer correctly with the hull's plane will significantly improve the detail and readability of your sonar imagery, distinguishing bottom structure and targets effectively.
Will the 20 ft cable be sufficient for larger vessels?
While the 20 ft cable is standard for many installations, larger vessels may require extended cable lengths for optimal head unit placement. Garmin offers various extension cables to ensure a proper and efficient connection regardless of your boat's size.
Is the GT20-TM compatible with older Garmin fishfinder models?
Compatibility with older Garmin units requires verification against the specific model's technical specifications. Referencing the Garmin compatibility chart or contacting support with your fishfinder's model number will confirm if the 8-pin connector and sonar frequencies of the GT20-TM are supported.
Frequently Asked Questions
What Garmin fishfinders are compatible with the GT20-TM transducer?
The Garmin GT20-TM transducer is compatible with numerous Garmin ECHOMAP and GPSMAP series units. Consult the official Garmin compatibility list for your specific fishfinder model to ensure a proper connection and full functionality.
What is the maximum depth range for the GT20-TM transducer?
The GT20-TM offers a maximum depth range of 1,900 feet for traditional sonar and up to 750 feet for DownVü sonar.
Does the GT20-TM transducer have a temperature sensor?
Yes, the Garmin GT20-TM transducer includes a built-in fast-response temperature sensor that provides real-time water temperature readings to your compatible fishfinder unit.
What is the difference between traditional sonar and DownVü sonar on the GT20-TM?
Traditional sonar at 77/200kHz provides a wide cone for general fish detection and water column coverage. DownVü sonar at 455/800kHz utilizes a narrower, high-frequency beam to deliver exceptionally detailed, photographic-like images of structure, debris, and fish positioned directly below the boat.
What is included in the box with the Garmin GT20-TM transducer?
The Garmin GT20-TM transducer package includes the 8-pin transducer itself with an attached 20 ft cable, transom mounting hardware, trolling motor mounting hardware, and a transom mounting puck.
