So I have these old Raymarine ST30 depth and speed instruments linked to an ST60 wind meter on my 2000 H340. The ST30 speed stopped working this summer. The display seems fine and I can toggle through the display functions but I get a zero for the boat speed. I pulled the transducer and found no damage and the paddle wheel spins freely but gives no reading on the display. I removed, cleaned and replaced the wires on the back of the display unit but still get no data. I can’t seem to find any source for a replacement transducer for the ST30. Does anyone have any information and/or advice on further troubleshooting or replacing the instrument with a newer model. I would like a replacement that will interface and work with my existing ST30 depth and ST60 wind. The instrument cluster is connected with the Raymarine SeaTalk cable. I have a suspicion that any new transducer will require the remove of the old thru hull and possible drilling of a large hole or worst yet, needing a smaller hole. I have call into Raymarine technical support and I am waiting for their input.