I think Interphase is a previous name of Echo Pilot (as is Incastec). Contact details are on their website www.echopilot.com/. I had Incastec Log and sounder on my boat and the sounder packed up. They look identical to the current Maxi range which Echo Pilot do but apparently have completely different electronics. Mine was not repairable but I was given a discount (circa 40%) on new kit as an existing user so you might qualify in the same way if your unit is beyond repair.