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The Garmin GT56UHD-THP is a dual-transducer thru-hull kit engineered for vessels with a deadrise greater than 5 degrees. By utilizing two separate transducers—one for the port side and one for the starboard—it provides an unobstructed 180-degree view around the keel, ensuring that the hull does not “shadow” or block the SideVü sonar signal.
This system is the premium all-in-one solution for deep-water and coastal anglers, offering Ultra High-Definition (UHD) scanning. It provides three scanning frequencies to optimize for both extreme range and photographic detail, along with High Wide CHIRP for traditional fish finding. The stainless steel housings are built for durability in harsh saltwater conditions.
Dual-Transducer Configuration: Specifically designed to provide seamless sonar coverage on boats with steep hull angles (up to 25°).
Enhanced SideVü Range: The 455 kHz setting offers significantly improved range, while the 1,000 kHz setting provides stunningly clear images of structure.
Ultra High-Definition ClearVü: Delivers nearly photographic images of what is directly beneath the vessel.
High Wide CHIRP: Features traditional sonar (150-240 kHz) for the best possible target separation and crisp fish arches.
High-Performance Fairing Blocks: Includes two fairing blocks to ensure smooth water flow and accurate readings even at higher cruising speeds.
| Feature | Specification |
| Manufacturer | Garmin |
| Model | GT56UHD-THP (Thru-Hull Pair) |
| Part Number | 010-02732-11 |
| Mounting Type | Thru-Hull (Stainless Steel Pair) |
| Connector | 12-pin (includes Y-cable) |
| Cable Length | 25 ft. (7.6 m) |
| Traditional Frequencies | CHIRP High Wide (150-240 kHz) |
| Scanning Frequencies | ClearVü/SideVü: 455 kHz, 800 kHz, 1000 kHz |
| Transmit Power |
Traditional: 350 W ClearVü/SideVü: 500 W |
| Max Depth (Traditional) | 800 ft. (244 m) |
| Max Depth (ClearVü) |
400 ft. (122 m) @ 455 kHz 200 ft. (61 m) @ 1000 kHz |
| Max Reach (SideVü) |
500 ft. (152 m) @ 455 kHz 200 ft. (61 m) @ 1000 kHz |
| Beamwidth (Traditional) | 24°–16° |
| Beamwidth (Scanning) |
1.1°x52° @ 455 kHz 0.64°x35° @ 800 kHz 0.52°x52° @ 1000 kHz |
| Supported Deadrise | 5° to 25° |
| Sensors | Depth and Temperature |
2 x GT56UHD-TH Transducers (Port & Starboard)
2 x Stainless steel stems
2 x High-performance fairing blocks
Y-cable (to connect both transducers to a single sonar port)
Isolation plates and bushings
Mounting hardware and documentation
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