There are bits and pieces on the topic, but haven't seen a comprehensive description.
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Three layers – What are the distances? Is the distance of the outer infinite?
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Color – Brighter red indicates more enemies, or distance, or level (above or below)?
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Showing up on the radar – Does firing your weapon make you show up brighter?
Best Answer
The following makes you show on enemy radar:
The radar indicates only 2D space. There is nothing to indicate height difference (above/below) at all.