ST60 Depth Issue

[NeilB]

Thanks Chuck, It does appear the problem may be the MFD. I did
disconnect all you suggested on Saturday trying to get the C120 to
turn off. It would not and I had to disconnect it. I purchased it used
last year, I did the 5.16 update and had a Electronics guy install that was recommended by the local West Marine. Everything seemed fine until an early spring cruise and I realized the depth was reading 95
and the depth was probably 30. This continued on each following
cruise until I started trouble shooting per our conversations and the
C120 started turning on and off, which only got worse each time I went to the boat. I have removed it and have requested a work order from
Raymarine to have it checked out. Hopefully the issue can be resolved.
Appreciate your help.