"bird sanctuary where all their crap would stay frozen was what I meant, but my word bubble suffered a collapse and I had to re-write a lot of it and I didn't proof read very well, as is my wont.

If I understood Rob Naylor's long post, above, it was that in fixing locations in the most sophisticated manner now possible we are not using 'sea-level' we are using the actual center of the earth as three dimensional (Cartesian) origin (0,0,0) so that various precise digital devices can coordinate.

Did I get that right?

I won't worry about it until I find someone is re-configuring everything to relate to the Center of the Sun.