Garmin Adapter Cable (P72/P79/GT30) Model: 010-12234-07 UPC: 753759146924Features Connect a Garmin GT30 transom mount scanning transducer and an Airmar P72 or P79 in-hull mount traditional transducer to a compatible echoMAP chartplotter/sonar combo. This adapter cable allows the echoMAP to continue to display water depth from the in-hull transducer in instances when the transom mount transducer loses depth reading due to cavitation.