Originally Posted by ackfoo
Quoting lakedude:
Triangulation doesn't require the points of measurement to be in a triangle, or even for there to be three of them
Maybe a picture will help you understand. Even if you had 100 satellites in a line there would still be a ghost point on the other side of the line of satellites with no way to determine which was the real point. The only way to determine the real point from the mirror image ghost is to have one satellite that is not on the same exact line (yes I know the earth is round and that this is really a 3 dimensional issue).
