But as has been noted before, it doesn't have to be a golfer.
Do the other handicap systems require the "accompanying person" be a golfer? (If so, the USGA might be expected to change that in the future, if they are to be unified.)
admittedly, I really do not understand Aimpoint or Aimpoint plus. I really cannot get a feel of slope from my feet. I had a little success from the two/three finger method, but mostly just rely on my eyes and touch. I can't complain though, I rarely have any three putts. Last round was 16 putts per side.
I was referring to an article I read somewhere and I believe it was related to Aimpoint Express where the golfer would stand ten feet or so away from the hole, and hold up 3 or 4 fingers towards the break and aimed there. I am possibly mistaken or it was something else. I already admitted to NOT knowing much about aim point. As I recall, the same article mentioned getting a small level from Home Depot to measure the degree of slope.