This is OpenAMD: http://amd.hope.net/frequently-asked-questions-faq/ It’s a cool “hacker” project, but I think it can actually be used to solve a number of real-world problems. Small, common problems that attendees of a conference have.
Problem #1: quickly and easily looking up information about the person next to you, in parallel with talking to them. Ideally silently and covertly, but the HUD is not yet available
Implementation #1: use the location API, figure out which is you, figure out which other has minimum distance, display all info about that one. Perhaps do this in real-time, so you should get an updated view when a new person walks up to you. And you can probably do this on your smartphone or on your laptop.
Problem #2: find a particular person
Implementation #2: this one should be pretty easy, you just need their uid, and you query their current coordinates. However, the grid coordinates might not be so human-readable, so a directional arrow would be nice. For even more icing on the cake, display their historical path, so you can guess which direction they’re moving.
Problem #3: finding a person by real name or other attribute (zip code?) This is an extension of #2. Use case: you know your friend Dave is there, but you’re not sure where he is. How do you find his tag’s uid? Hopefully you can query just by name or handle to get the uid.
Implementation #3: sounds like you’ll have to query a separate database of metadata to see if you can identify the uid of the person based on the information that you have