What is the use of imu?

IMUs are often included in inertial navigation systems that use raw IMU measurements to calculate orientation, angular velocities, linear velocity, and position relative to a global reference frame. IMU-equipped INS form the basis for navigation and control of many commercial and military vehicles such as manned aircraft, missiles, ships, submarines and satellites. IMUs are also important command and control components for unmanned systems such as UAVs, UGVs and UUVs. Simpler versions of INS, called attitude and heading systems, use the IMU to calculate the vehicle's heading position relative to magnetic north. Data collected from the IMU sensors allows the computer to track the ship's position using a method known as dead reckoning.https://www.ericcointernational.com/inertial-measurement-units

In land vehicles, the IMU can be integrated into GPS-based automotive navigation systems or vehicle tracking systems, giving the system dead-reckoning capabilities and the ability to collect as much accurate data as possible about the vehicle's current speed, turn rate, heading, and lean. and acceleration in combination with the vehicle's wheel speed sensor output and, if available, the reverse signal, for purposes such as better traffic accident analysis.

In addition to navigation purposes, IMUs serve as orientation sensors in many consumer products. Almost all smartphones and tablets contain IMUs as orientation sensors. Fitness trackers and other wearable devices may also include IMUs to measure movements such as running. IMUs also have the ability to detect people's developmental levels during movement, determining the specificity and sensitivity of specific running-related parameters. Some gaming systems, such as remote controls for the Nintendo Wii, use the IMU to measure motion. Low-cost IMUs have fueled the rapid growth of the consumer drone industry. They are also often used in sports technology (technical training)[4] and animation applications. It is a competing technology for use in motion capture technology.[5] The IMU is at the heart of the balancing technology used in the Segway personal transporter.

https://www.ericcointernational.com/inertial-measurement-units