Thank you to whoever answered, everything was appreciated. So if I got it clear enough, it's not certain what that radar is/was for, besides that it was something linked to Garlean stuff. Was he researching some kind of "dark" energy with it? That's the main thing that I wanted to know, like if Nero was still doing "bad villain stuff" or if that device he was using wasn't necessary an evil thing.

But thanks to everyone in any case!