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Gatherer is a WoW addon for herbalists, miners and treasure hunters. It's main purpose is to track the closest plants, deposits and treasure locations on you minimap.The addon does not track like a tracking ability does, rather it "remembers" where you have found various items in the past. It does this whenever you gather (perform herbalism, mining or opening) on an item, and records the specific map location in it's history. From then on, whenever the item comes into range of being one of the closest 1-25 (configurable) items to your present location, it will pop up on you minimap (see screenshot here).