Telemetry needed for using a gamepad?

telemetry can be two-way communications. You can use serial communications over radios, USB WiFi and even USB 3G/4G modems. Many users have had success using network connections with gamepads for control but there will be more latency than using traditional RC radios.

Check out the following links for more info.

http://uavmatrix.com/Blog/38

Robert