8ee68c2d_RMS___Wichita_State_University__Answer
[Topic] Line Follower [Question] Can we get clarification on the 1" tolerance? [Answer] 
The robot is considered off the track by 1" when the robot is completely off the black track by more than 1." That section will still be counted when it when off track.
SHOCKER MINDSTORMS - Wichita State University
Answer