Big storm last night. Had to drive through some running water, about 10" deep. So I tried out one of the (terrain response) 4x4 modes, the one for mud. (my evoque only has 500 miles on it- so I haven't played with it off road yet). Anyway- up popped this display. The white arrow moved in from the right. What does the green bar mean? what is the white arrow? what is the purpose of the display?