<Table> <Tr> <Td> </Td> <Td> This article contains content that is written like an advertisement . Please help improve it by removing promotional content and inappropriate external links, and by adding encyclopedic content written from a neutral point of view . (February 2010) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article contains content that is written like an advertisement . Please help improve it by removing promotional content and inappropriate external links, and by adding encyclopedic content written from a neutral point of view . (February 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> An attitude and heading reference system (AHRS) consists of sensors on three axes that provide attitude information for aircraft, including roll, pitch and yaw . These are sometimes referred to as MARG (Magnetic, Angular Rate, and Gravity). sensors and consist of either solid - state or microelectromechanical systems (MEMS) gyroscopes, accelerometers and magnetometers . They are designed to replace traditional mechanical gyroscopic flight instruments . </P> <P> The key 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 versus an IMU which just delivers sensor data to an additional device that computes attitude and heading . In addition to attitude determination an AHRS may also form part of an inertial navigation system . </P>

Attitude and heading reference systems (ahrs)