Very interesting; thanks for this.
Was he driving 1mph?
Pro teams all get to pre run the complete coarse, driver and navigator, the driver rates all turns on the GPS, R-L- 1 thru 9, so R-4, L-4, Then driver rates Danger spots and Caution area's, navigator marks them as the driver calls them. As they race, navigator calls one turn a head of the turn they are in.
The catch, the "Natives" LOL, Mexicans mostly, Sabotage the coarse in places after they pre run the coarse, then sit and drink and party and wait...
If your of the party age, and not afraid to go to Ensenada B.C. you can go and watch the trucks and rails drive thru town, and watch at the starting line, but be careful! Its crazy, and it can be dangerous, people stand way too close to the road, and people die some times, don't be one of them.