Interesting, Rob. I just learned of this. Your map is exactly what I had in mind. Very nice. This should be a help for RDs in finding timing points, particularly in those locations where paint and or nails cannot be applied.
Jane, it is difficult for me to grasp what would account for these differences. Getting to the general area is surely helpful, but if the delta is more than a few meters, the usefulness is diminished, isn't it? It sounds as though you are saying we should indicate to our users which mobile technology the grid section in question was identified with so that they get to the intended location.