According to Designer George Ziets [1], the survival skill "expands the range you can see hostile creatures on the minimap, while in Tracking mode. Any character can activate Tracking mode, but only characters with the Track feat and points in the Survival skill are going to get much value from it."
Note: If a NPC/monster is set as neutral and only appears hostile once catching sight of your party, Survival and Tracking can not detect them in neutral mode. This includes undeads.
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