Got a digital camera? Got a CD burner? If so, you can give a race director a little bit extra next time you measure a course. Just photograph the splits after you get them painted. Take a ton of pictures – after all, once you have the equipment they cost you nothing but a little time, plus a dime for the CD. Put them on a CD and send it to the race director.
The photos also serve to refresh your memory when you are writing up the measurement.