This approach is used very commonly - e.g. every airliner, submarine and military plane will have such a navigation system (augmented with GPS these days obviou

This approach is used very commonly - e.g. every airliner, submarine and military plane will have such a navigation system (augmented with GPS these days obviously). The issue is that the system naturally drifts, so over time it will accumulate error which has to be mitigated somehow (e.g. in military equipment with finding a known landmark and fixing on it). The so-called INS systems are quite the marvel of mechanical technology: https://en.wikipedia.org/wiki/Inertial_navigation_system https://en.wikipedia.org/wiki/Inertial_navigation_system