What is the maximum altitude a recreational pilot can fly without an endorsement from an authorized instructor?

The maximum altitude a recreational pilot can fly without an endorsement from an authorized instructor is 10,000 feet MSL, but they are limited to 1,200 feet AGL where they can operate without additional training or endorsement. This regulation is part of the operational limitations set for recreational pilots, requiring them to have an instructor endorsement for flights above certain altitudes. The intent behind this regulation is to ensure that pilots have the necessary experience and understanding of flying at higher altitudes, where factors such as weather, air traffic, and aircraft performance become more complex. Therefore, the correct altitude for recreational pilots to operate without needing extra authorization is indeed at or below 1,200 feet AGL.