Garmin Transducer - AIRMAR R111LHGarmin Transducer AIRMAR R111LH Garmin AIRMAR R111LH are in hull or pocket mounted transducers that use narrow beams at low high frequencies to display depth and temperature data to your Garmin Marine Network via your sonar, such as the GSD 26. Garmin AIRMAR R111LH Key Features Designed to allow both traditional and Spread Spectrum scanning, this 2 kW bare wire, plastic transducer has a maximum depth of 8,000 ft; an operating frequency of 38 to 75 kHz