What if the copter flied out of the rang of rc controller?

ArduCopter Copter 3.1
1

Hi,
i want to ask a stupid question, i use rc controller to control the copter. but rc controller have range limit. what if the copter flied out of the rc controller range? will it become a drift copter and can not be controled by anything? If so is there any way to avoid that.

2

@johnwu,
RTFM: http://copter.ardupilot.com/wiki/throttle-failsafe/
Regards,
TCIII GM

3

thanks