Proof of concept. A mobile location service

Hey and have a good time of a day

I had a wild idea to try to deveop an application in upcoming hackatron that, will help to locate people in indoor or outdoor events. Would a system, where the is lets say 3 beacons of what 2 are on locators body for example and the third one will be the findable beacon, make some sence? Will BLE beacons provide reasonable accuracy. No stationary beacons. What would be the main problems of that setup and what deveopment platform I should choose?
I’ve started to study this topic yesterday. Please give me right directions.