I've had Lowrance units on my boats for longer than I can remember. But as the technology gets more complex, I have had more issues with them. Presently I have HDS Carbons on my boat. I have one unit that zooms in and out on the chart page as I motor along. I spoke with the factory and I need to send it in for repairs. Out of warrant of course $$$.
Now my other unit decided to sometimes display a different number for depth than the graph is showing. I know. Check data source on edit overlay. I did over and over. But it's intermittent. It will be spot on, then not. Back and forth.
If I didn't have a Ghost and Lowrance units all around, and an extra 6, 7,000 dollars laying around I'd replace them with another brand.