Thats the purpose of an IMU[0]. But even the best IMU have a limited amount of precision, and, has time goes by, these imprecision can accumulate to a very big

Thats the purpose of an IMU[0]. But even the best IMU have a limited amount of precision, and, has time goes by, these imprecision can accumulate to a very big margin of error in your location. With the cheap IMU in phones, you very quickly reach the 100+ meter margin. That is why you usually combine it with other sources of localization to keep the margin down. If no other sources are available, the localization provided by the IMU become next to useless. [0] https://en.wikipedia.org/wiki/Inertial_measurement_unit https://en.wikipedia.org/wiki/Inertial_measurement_unit