I have an Autohelm SD 50 depth guage. We rafted up with another boat and ever since then the depth meter either works, or flashes "00" and will not respond to pushing any control buttons. This also happened with another brand of depth guage on a previous boat, also after having been rafted up with another boat. I have checked all connections. Is this rafting thing a co-incidence, would two transducers reading off one another influence the instrument ? Where are Slully and Mulder when you need them !