The task of GO is to collect data and provide them to the manager in an easy way, so that the manager can concentrate on managing his team and making decisions.
As a GO user, you will be able to download the latest information about your car, driver and performance and you will have an access to important old information.
You can export practice data to share with your team mates, exchange car update information with through the 'Car History' window and use the 'Pit strategy' tool to plan your pitstops for the next race.
I find this essential for my progress in the GPRO gsme.
Works pretty well for years. Good work!