I do understand that there are facets of the hobby where 400 feet is an issue. I guess my main point is that there are ways to become aware of what 400 feet looks like approximately with respect the the aircraft that you might be flying and that being absolutely exact about breaking that ceiling is not really necessary. I do hope that there can be some negotiated exceptions to the 400 foot rule for those who require more altitude. Though I have never done it I think that sailplanes and slope soaring would interesting to try, these also require a higher altitude limit.

Jim