Thanks for the reply.
I currently have a Helix 7 DI and two Helix 7 SI. The SI units are networked, the DI is not. Can’t say that I have noticed any difference in the DI between the two. More important, I rarely spot any fish in SI or DI modes so I just use these modes to learn structure in new waters.
So you are saying I can see a 9” rock at 25m or a 9” fish at 25m? If the later, I’d really have to see it to believe it.