While walking is swiss snowy mountains, Mirweis pointed me on this World of Warcraft add-on called The Gatherer:

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. (...) The usage of Gatherer is fairly straightforward. You simply use the game as normal, and the tracked items will appear in you minimap as soon as you gather them. On the minimap you see green circles to indicate if you're close by to a node (if there is data for the node - created from a previous harvest). On the zone maps you will start to see icons indicating an overall picture of the resource layout of a zone.

One of the use ask another requirement... a spatial annotation feature: "May I humbly request: the ability to toggle World Map notes on and off (ideally with a button provided on the world map itself)", others wants location awareness of others: "I would be really cool if it could track more stuff like NPC's. I often use much time on trying to remember where the Quest NPC is when I need to claim my reward.".

Why do I blog this? I am interested in location awareness and video games... This kind of thing is utterly crazy and might be interested for my research. There are tons of questions that could be relevant like why and how people keep track of things/people; how this help them achieving their goals (collaborating, working on a specific task...), ...