What is an Inertial Navigation System?

We use the Inertial Navigation system every day in our life. It is in our mobile phones, it is in our smartwatches, it is in our cars. INS system is in the Rockets we launch and in Rovers on Mars. In this video, I discuss what is behind this INS system, in the simplest possible way I can.
#InertialNavigationSystem #INS #navigation