OK so just been to the altruist camp, my findings (which you may or may not find of interest). Regardless I wanted to log them.
After reading all the markings around the camp, the symbol at the top of the muriel is most likely the sun with an eye in the middle (some seem to think it's a UFO). The sun is worshiped by them as a vessel used by god to watch over them.
At night time, I found the police that gather outside the camp. Interestingly, they were all outside of their vehicles staring in the opposite direction, directly at Mount Josiah (pics taken). Could this be a hint as to which mountain the muriel represents?
Also, this guy was a few yards in front looking in the same direction (he's wearing an ear peice, which i found interesting). Sorry it's so damn dark. He is wearing pedestrian clothes.
As people seem to like satellites, there is one on top of the furthest house next to the sacrifice stone, pointing out into the ocean.
Points to note:
I talked to the guys staring over mount josiah, and they got pissy and walked off.
I stayed there till 4am and it was raining, I saw no lights in the sky or any activity in the direction of mount josiah/Fort Zancudo.
Does the sun raise over Mount Chiliad in the mornings? I would have stayed to find out, but the Police ended my life at around 4am.