What do you mean by "earth moves" do you mean tectonic plates ? Wouldn't that apply to any of the other global location descriptions (GPS coordinates) as well?

What do you mean by "earth moves" do you mean tectonic plates ? Wouldn't that apply to any of the other global location descriptions (GPS coordinates) as well? And is this really less permanent than street names/numbers that may be changed several times over the course of a few hundred years? If you are going to describe a path to an ancient tomb, Indiana Jones style, than the movement might matter but over the timespans this system is used I don't think earth movement is an issue.