I'm not saying the signal wouldn't be there. I'm saying that the area of the sonar display around the signal is the darkest that monitor should be able to get. The weakest signal you could detect on that monitor should be that same color. It shouldn't be "darker" than the background of that sonar display, that wouldn't be physically possible. What I mean is, you know when you first get a track and it's easy to see because it's pitch black? As it increases in signal strength a bit, it actually becomes harder to see? That is what I'm talking about and that shouldn't happen - you basically have a negative brightness with respect to the color spectrum possible on that sonar display. The faintest color possible of that signal should basically match the background color of that sonar display.
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