It probably only works for you part of the time.
One thing that is not arguable is the science behind how it works, which usually means that the orientation of the filter needs to be a certain number degrees from the angle of the sun. That's what the mark means on the ring.
So if you take a picture of a building at one angle and just happens to be at the right angle, then you move to take a shot of the same building from the next side, then it will not work the same as it did for the last shot.
Getting the same results from both sides of the house would require you to land the craft and adjust the ring. To be proper, you would have to look to the new direction through the CP (or through the camera) and see it working as you turn the ring until you get to where you want it. The mark on the ring is for your reference to remember that setting (so as you move around from shot to shot, you don't always have to check it manually).
Leaving the ring at 12 o'clock means that it will only be 100% effective if the sun is 90s to the left or right of the camera orientation.
Of course, you will still get partial effectiveness at angles in-between, which may be fine for someone that doesn't want to be bothered with the whole landing and ring-adjustment thing. There's nothing wrong with that, but readers should know how this works.
"Polarized light is light who’s rays have been scattered due to pollution, moisture in the atmosphere and reflection. A circular polarizer filter only allows light rays that are traveling in one direction to enter the lens. "
Chris