Delta Line records your own runs and, on maps where you've finished with it running, compares every moment of your current run against your PB. A gap bar shows how far ahead or behind you are right now, not just at checkpoints. Your PB's driving line is drawn on the track ahead of you. Behind you, your trail turns green where you're gaining time and red where you're losing it. It handles checkpoint respawns, shortcuts and multi-lap maps, and keeps a separate PB for each lap count.