a device in an aircraft or a ship that keeps it on a fixed course without the need for a person to control it （飞机的）自动驾驶仪；（船的）自动操舵装置
Idioms
be on autopilot
to do something without thinking because you have done the same thing many times before 习惯性地做；机械性地做 I got up and dressed on autopilot. 我起床，穿上自动驾驶仪。