I have a 1 year old boat with 2 helix 10 si gen 2 units. It seams like the 2d and down image depth read 1.9 and show the same thing on the screen at least 75 percent of the time. If you look at the si you can tell the transducers are working ok. I have owned 8 helix units and they all have had some 2d issues but these units seam to have the most issues. Does any one have any idea what to do to fix this. I would use my 360 to judge depth on my last boat and the through hull 2d seamed to work ok. I just added a Garmin Ultra 10 for live scope. To my surprise the live scope transducer has temp and 2d reading and both are dead on all the time.