Looking at the Racelogic screen they have a graphical representation of if you are going faster or slower on the splits via a bar graph. Go to the left your faster to the right your slower. Great for when your driving as you can just glance instead of looking and trying to see numbers....
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Discussed on a forum:
http://www.vx220.org.uk/forums/topic/114318-review-of-predicitve-lap-timer-video-data-logging/