I own a ES127 and am looking to upgrade the software to LH3. Will my installed 600w P319 transducer work with this new software upgrade?
Welcome to the Raymarine Forum fairfaxdw,
Should the MFD have been successfully used with the fishfinder transducer in the past, then updating the MFD's software to LightHouse 3 should expected to have no impact upon the transducer's compatibility with the MFD.