FPV

First Person Video or First Person View (FPV) involves the transmission of live video from the vehicle back to a display at the user. It also is typically used to refer to a mode of flying involving controlling the plane through the live video feed and a standard RC controller rather than watching the plane via line of sight. FPV allows the user to fly as if they were 'in the cockpit' without shifting orientation issues. FPV systems have to be on a different frequency than control systems, can be somewhat unreliable, and safety precautions usually recommend not flying them outside the distance that one can see the plane unaided, in case the FPV fails completely.

An OSD system, which shows instrumentation and telemetry during the flight in an overlay on the video
A directional antenna system, optionally with an antenna tracker
A gyro, which can help keep the plane level through turbulence and reduce the number of small corrections the user has to make, while also enabling 'heading hold' mode
An emergency location finder, to track down the model if all batteries fail
An autopilot capable enough to 'return to home' in the event that communication is lost
A 'Buddy box' setup where a second person can take over if something happens to the main pilot
A Head tracker