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Instrument: IMU : Inertial Measurement Unit
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Description
An inertial measurement unit (IMU), is an electronic device that measures and reports on a craft's velocity, orientation, and gravitational forces, using a combination of accelerometers and gyroscopes, sometimes also magnetometers. IMUs are typically used to maneuver aircraft, including unmanned aerial vehicles (UAVs), among many others, and spacecraft, including satellites and landers.

Online Resources
http://celebrating200years.noaa.gov/visions/remote_sensing/imu.html