I updated my Helix 10 today with the latest software and now I'm having a similar issue. The depth number (reading) jumps from correct to say 350ft or 227ft or any number of depth readings. The actual depth/bottom on the 2d view will be fine it's just the depth number on the left that goes crazy. This unit is connected to a hdsi transducer along with a shoot through hull. Never had this issue until I updated the software. I'm going to call HB for all the good that will do.