They generally asked for your cross streets, then looked at the giant street map on the wall to figure out where you were. Not exactly an unsolvable problem.
Edit: and it’s not like they needed turn by turn directions. Just figure out where to go from the cross streets. Oh it’s northwest of Maple and Cyan, 3 streets into the neighborhood. The drivers can get to the crossroads on their own, that’s just local knowledge.
I played this three times! There was a qualifier round, then a quarter final or something on stage, and I did well enough in that that I got to come back the next day and lose on stage! I peaked in 1990.