A small correction, ND filters are used for still photography, often in order to get a soft blur on water falls, rapids and sea scapes. There are many reasons to use ND filters and polarizers for artistic reasons. And with the amazing ability of...
First off, your ceiling should have been 400 feet.
Second, the obstacle avoidance should have been turned off for the RTH since the drone can't see obstacles.
The drone OA needs to "see" to be able to detect obstacles. Without the contrast of...
I like the statement “They have an amazing potential for both good and ill. We will increase the enforcement of current laws to deter two types of individuals: evildoers and idiots—the clueless and the careless.”