I don't really know why but in both F1 2017 and 2018 game I have the same problem. App shows and works just fine when you set it up as instructed but gaps are always incorrect. For example, in-game information says car behind is 8.6 seconds but app shows 5.7, no matter what I do times are always off. I will never understand why this timing tower is not already in-game instead of that useless one.