Well I can name one case off the top of my head, a guy (Jambo on steam) was developing a screenshot tool (iirc, not 100% on this) and forgot to turn it off before joining a secure mode server. And that ban got lifted quite fast.
But the sonar software's function is worse than learning to position sounds on your own and adding a crosshair with a monitor / sticking some blu tack to it can never be detected. But honestly a game where adding your own crosshair gives an advantage has silly mechanics.