RE: In the National Airspace System (NAS), what class airspace do you normally fly in?
Sport Pilot if the FAA has no jurisdiction over aircraft below 500' AGL in class G airspace then how can they justify the 500' distance requirement from persons, vessels vehicles, or structures. This is vertical or horizontal. According to your understanding if I am below 500' they have no jurisdiction at that altitude. I understand you used the term navigable, that is in reference to the airways. If you look at sectional there is the blue border around the airways that defines the navigable borders. There is only a few (less than a handful) very small areas that fall under your definition, and these are in the western deserts. I can garantee that if you look at a local sectional you will not find one acre of land in your area that is classified non-navigable.