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Ducati999 Ant, as you know I'm big into visualizing the course before, during and after the day. That idea of drawing the track is great.
I started doing a variation on this last season that might help you with the memory thing: I print out a track map and take notes on it between sessions, while things are fresh in my mind. Initially marking the location of cones, pavement markers, stuff like that.
The one I have of Palmer has the note "Don't do what Ant did" written next to Turn 7.
Since you're in the business world, you may have noticed something: More and more people are carrying journals and notebooks, and writing things down instead of typing. I've taken to doing this myself. I even devoted a page in my current journal to track thoughts that I jot down as they occur to me. I find that the act of writing and drawing makes you process information differently. It gets "stickier" and easier to recall. I heard recently that more and more students are starting to do this as well.
This might be useful to you.