Cool car -- but some of the description on the video isn't quite right...
1. The car uses Differential GPS
so... Read the text -- the video part isn't right about this.
2. GPS was originally developed by the US military for miltary purposes. The GPS data provided is extremely accurate. There isn't an error in GPS data. Of course, the ability to get the most accurate positioning using just GPS is reserved for the military, thus use of differential GPS is necessary for civilain use. If this wasn't the case, *smart bombs* might have an issue.
Anyways, just wanted to clear that up.