The TBS Discovery was my first non-toy quadcopter. I bought it used in 2013, together with Fat Shark Attitude V2.0 video goggels and a Graupner radio transmitter.
The Discovery has seen many changes, from a very hacky early version of the minimOSD on-screen-display, modified to work with the original GPS and flight controller system by DJI to a gimbal, landing legs, a drop mechanism for a small glider and a camera switch to remotely switch between the three cameras I installed on the aircraft.
