Originally Posted by wstar

I've found the predictive lap times on my current datalogger setup *really* helpful. It's a mode where, as you go around the track, the display shows a prediction of what your lap time will be (based on your lap time-vs-position compared to other laps), and gives a display something like:

1:20.44 (predicted full time for current lap-in-progress, which varies up and down)
+0:03.44 (prediction above is 3.44 seconds slower than your best)
(and then red/green background for whether the current prediction is running faster or slower than best)