When I first trained 20 odd years ago, my captain (observer to you) made me memorize the numbers and colors of the cars as they went by. That wasn't too hard as I began my racing career in Timing. By the time I got the blue flag in my hand, I could recognize the cars coming at me and started to learn speed differentials by noticing the order in which the cars came around and noting the space between them. All these years later, when I go to flag a series I haven't been following, I fall back on the same visual cues.
As for blue flagging qualifying, I think it is the most difficult session to flag - and therefore the most fun. But to do it well, it takes practice and more practice so you can spot who's on a hot lap and who's just on a sighting lap.
Good luck. All these years later, I still love it.
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