Why do I need a GNSS/INS for autonomous driving? 

Localisation is a core component of an autonomous vehicle’s control stack. Localisation tells the vehicle where it is and how it’s moving, and combines with perception modules to give the vehicle the information it needs about the environment it will be navigating in. A GNSS/ INS provides high accuracy, low latency localisation data in real-time that feeds the rest of the autonomy stack to enable autonomous driving.