Fond this on the Spectrum IEEE site. Some pretty interesting stuff here on a new generation of "drones". http://spectrum.ieee.org/automaton/robotics/aerial-robots/drones-that-follow-you ...Tiger
I have a APM2.6 board that will do this but i have never tried it . This is the board i started out with but it scares me so i went with a kk board . I had a little accident where the quad got a mind of its own and would not respond to my commands and came after me