> 1500ft AGL Thats critical. Below 500ft and away from airports you're basically out of manned use airspace. above that (depending on the area) and now you'r

> 1500ft AGL Thats critical. Below 500ft and away from airports you're basically out of manned use airspace. above that (depending on the area) and now you're creating a very real hazard for manned aircraft.