Before revision: The main difference between an Inertial measurement unit (IMU) and an AHRS is the addition of an on-board processing system in an AHRS, which provides attitude and heading information.
After revision: <ref>Cite web |title=How It Works: Attitude and Heading Reference System - FLYING Magazine |last=Whitfield |first=Bethany |work=FLYING Magazine |date=16 September 2016 |access-date=15 August 2023 |url= URLThe main difference between an Inertial measurement unit (IMU) and an AHRS is the addition of an on-board processing system in an AHRS, which provides attitude and heading information.