Airmar TM275C-LHW Transducer With Garmin 12-Pin MMC

The Airmar TM275C-LHW Transducer With Garmin 12-Pin MMC is a professional-grade transom-mount sounder head built for serious anglers and boaters who demand accurate depth, temperature, and target data without compromise. Whether you're fishing open water, navigating coastal shallows, or surveying structure in lakes, this wide-beam CHIRP transducer delivers the real-time clarity needed to locate fish and avoid hazards. Designed to integrate seamlessly with Garmin chartplotters via the standard 12-pin Mix-N-Match cable connection, it's the ideal upgrade or replacement for systems already running Garmin electronics.

This transducer operates on dual-frequency CHIRP technology, with a low-frequency channel transmitting between 42–65 kHz at a wide 25° beamwidth for broad coverage and excellent target separation, while the high-frequency channel delivers narrower 16° beamwidth for precise bottom definition and structure identification. The integrated fast-response water-temperature sensor feeds real-time thermal data directly to your display, helping you locate thermoclines and seasonal migration patterns. The transom-mount design allows straightforward installation on boats up to mid-size hull configurations, with the low/high wide designation indicating optimized performance across varied water depths and bottom types. At 13 lbs, the unit is substantial enough to maintain stability while remaining manageable for typical transom installations.

Anglers running existing Garmin 12-pin systems—including legacy GPSMAP and newer ECHOMAP units—can upgrade their sounder performance without rewiring the entire boat. Professional guides, tournament competitors, and recreational boaters who fish variable depths benefit most from the wide-beam low-frequency performance for initial target acquisition and the narrow-beam high frequency for detailed bottom mapping. Installation requires a transom-mount bracket and proper cable routing; ensure your boat's transom is solid fiberglass or reinforced material, and keep the transducer fully submerged during operation for optimal acoustic coupling and accuracy.