C120W with AirMar P66 Not Recording Speed

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum ProLine23Sport,

Should you have selected the P66 transducer from the transducer list within the Fishfinder application's settings, then the reported issue would be indicative of a failure within the P66 transducer or the DSM30, DSM300, CP300, or CP370 which has been interfaced to the MFD. Should the correct transducer have been selected from the transducer list, then easiest way to fault isolate the problem would be to test the system with another P66 transducer which has been mated to the sounder module to facilitate testing. Should 3-5 seconds of rapidly spinning the test transducer's paddle wheel by hand not result in a non-zero speed being reported, then the sounder module would be deemed to have suffered a failure, necessitating that it be sent to Raymarine’s Product Repair Center to be bench checked / serviced or replaced with a CP370.