GEONAV AIRMAR P79 170kHz 31-863-1-01 NAV80130 In-Hull Transducer f/ GEONAV F170GEONAV AIRMAR P79 170kHz 31 863 1 01 NAV80130 In Hull Transducer f GEONAV F170 Works perfectly, fully tested with guarantee. TRANSDUCER P79 The P79 in hull transducer easily adjusts to hull deadrise angles up to 22. This ensures that the beam is vertically oriented to receive echos resulting in accurate depth readings. Unlike traditional "puck" type transducers, our P79 consists of a base that is bonded to the hull and filled with liquid. The separate