Correct, AMA used to say that you had to stand behind a line that was 25' from the runways edge,, but that has been changed.. I know because we had a nasty disagreement at our club over that rule.. We had to very carefully examine the rules to come up with the correct decision.. At that time it was pretty well spelled out,, that stuff isnt in there anymore..

Clubs can make more stringent rules they want as long as they are within the AMA rule boundaries.