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The Garmin GT30-TM and GT15M-IH Transducer Bundle is a high-performance sonar kit tailored for coastal and offshore anglers. This package is specifically designed for fiberglass hulls with a deadrise of 0° to 25°, offering a dual-transducer approach to maximize sonar coverage and clarity.
By combining a transom-mount scanning unit with an in-hull traditional unit, this bundle allows you to maintain accurate depth and target readings while traveling at high speeds, while still benefiting from ultra-clear scanning imagery once you reach your destination.
GT30-TM (Transom Mount): A dedicated scanning transducer that provides CHIRP ClearVü and CHIRP SideVü. It excels at providing photographic-quality images of structure and fish beneath and to the sides of the boat.
GT15M-IH (In-Hull Mount): A mid-band CHIRP traditional sonar (85-165 kHz) that is mounted inside a plastic tank within the hull. It is the ideal choice for boats traveling at high speeds that need to maintain consistent bottom tracking without turbulence interference.
12-pin Y-Cable: This included adapter allows you to connect both the 12-pin (GT30) and 8-pin (GT15M) transducers into a single 12-pin sonar port on your Garmin chartplotter.
| Feature | GT30-TM (Transom Mount) | GT15M-IH (In-Hull Mount) |
| Sonar Type | CHIRP ClearVü & SideVü | CHIRP Traditional (Mid-Band) |
| Frequency | 455 / 800 kHz | 85–165 kHz |
| Transmit Power | 500 W | 600 W |
| Max Depth/Reach | 750′ (CV) / 500′ (SV) | 1,900′ (Freshwater) |
| Beamwidth | 1.4°x53° @ 455 kHz | 24°–13° |
| Cable Length | 20 ft. | 20 ft. |
| Connector Type | 12-pin | 8-pin |
| Supported Deadrise | 0°–70° (Transom) | 0°–25° (In-Hull) |
| Sensors | Depth and Temperature | Depth Only |
GT30-TM Transducer (12-pin)
GT15M-IH Transducer (8-pin)
4 Plastic In-Hull Tanks (to match various deadrise angles)
12-pin Y-Cable (combines both into a single 12-pin sounder port)
Mounting hardware and documentation
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