Which device on a UAS provides attitude information such as roll, pitch, and yaw?

• A. GPS
• B. IMU
• C. Altimeter
• D. Compass

Answer: (B)

Attitude refers to orientation in space—roll, pitch, and yaw. The device that provides these measurements is the Inertial Measurement Unit. The IMU combines sensors that sense motion and orientation: gyroscopes track how fast the aircraft is rotating about each axis, and accelerometers sense tilt relative to gravity. By integrating the rotational rates and referencing the accelerometers, the system can determine roll and pitch. Yaw (heading) is established using a magnetic reference, typically a magnetometer, which is often included in or used with the IMU. Other sensors like GPS provide position, and an altimeter measures altitude, but they do not give the aircraft’s orientation.