system
Given the following post, respond as if you're commenting on Reddit:
human
[fallout] I've inherited a pip boy, and I'm now using it as I travel. Its really amazing. Best bit is that it warns me infallibly if people I'm approaching are hostile or friendly. How does it know?

Long story short I grew up in a little town in the middle of nowhere. Granddad was from a vault, and kept his pip boy until he died. But he never really talked about how it works (or much else from his vault life, bad memories I think). So I've mostly been working it out through trial and error.

So anyway, a few times I've seen people in the distance with no obvious raider markings who the machine marked in red. And, what would you know, the moment they saw me they started shooting! (Thank god for vats and stimpacks it is be dead a dozen times). This is really useful, but i don't understand how it works. It can't read minds or something can it?
gpt
Starting from the Pip-Boy 2000, **RobCo Industries** intergrated a simple form of sonar and satellite tracking. While this is mostly to provide satellite coverage for mapping out the areas that your grandad and you travel, it is also quite efficient in labeling out individuals and what they're carrying. Using the ultra-modern super-deluxe graphics, plus it's high storage capacity, it is able to detect and single out potential enemies and mark them out for you in red.

For instance, if it singles out a person wearing likely raider armour and carrying a gun around areas prone to raider activity, it will mark them in red.

However, it makes mistakes sometimes. It singles out most of the mutated animals as enemies. While a lot of them are, it has a tendency of marking radstag does as enemies even though some tend to be docile or cowardly.