Garmin Airmar 509LHW 3kW 28 to 60kHz & 150 to 250kHz Thru-Hull Transducer

The Garmin Airmar 509LHW 3kW 28 to 60kHz & 150 to 250kHz Thru-Hull Transducer is purpose-built for serious anglers and boaters who demand precision sonar performance in both shallow and deep water. This dual-frequency transducer is the gold standard for modern fish finders, delivering high-resolution imaging across multiple frequency bands to help you locate structure, baitfish, and your target species with confidence.

Whether you're running offshore for tuna and marlin, working inshore flats for redfish and tarpon, or bass fishing your local lakes, the 509LHW bridges the gap between clarity in tight areas and long-range detection in open water. At 3kW of power output, this thru-hull transducer generates strong acoustic signals that cut through noise and thermoclines to deliver crisp returns at extreme depths. The dual-frequency design—28 to 60kHz on the lower band and 150 to 250kHz on the upper band—allows you to toggle between wide-angle, broad-coverage sonar for general search patterns and narrow-cone, high-detail imaging for pinpoint target acquisition.

The thru-hull mounting design ensures maximum acoustic coupling with your hull material, eliminating water turbulence interference common with transom-mounted units and providing superior performance across all boat speeds. Constructed to withstand saltwater corrosion and designed for direct hull integration, the 509LHW delivers reliable operation season after season when properly installed. The Garmin Airmar 509LHW is compatible with various Garmin fish finders and chartplotters, making it an essential tool for any serious angler.