That has to be the stupidest thing you have ever posted. Where could you ever get such a false opinion?
" but if you are really a surveyor, you are using equipment that relies on the GPS satellites"
Occasionally I do. - GPS is good for control surveys for highway routes, or other such work where long distances are concerned, or in work where accuracy is unimportant, such as tagging water meters, fire hydrants, sewer manholes, etc. But for most work GPS is useless because obstructions will introduce error that cannot be accounted for. GPS accuracy depends on a uniform horizon, and in close quarters such as a residential neighborhood, it is not attainable, so using GPS will quickly get you in trouble. Some will do it anyway to cut costs, but at some point that kind of bravado will come home to roost.
The kind of 'shifting' you are talking about is not due to failing to account for relativistic considerations, but due to deliberate error that is injected into the broadcast ephemeris, called Selective Availability; that is not presently done anymore. Most high precision GPS work is not taken in realtime, but is post processed with statistical correction to conform to the accepted positions of existing ground stations. Realtime GPS surveying is done with what is called Realtime Kinematic processing, which cannot deliver precision without long observation times. For this reason conventional "total station" equipment is more efficient unless the site is clear of buildings, billboards, trees, or poles that interrupt the sky.
A few weeks ago, you were insuating that relativity is like evolution on another thread.
My friend is a surveyor and he uses equipment from Trimble that is accurate to a centimeter. It’s not to cut costs as that equipment costs $$$. Yeah, if you are surveying between skyscrapers in a city, there will be errors, but most places, they work fine.
I know all about selective availability as my hobby is geocaching, and it wouldn’t be in existence if Clinton hadn’t gotten rid of it in 2000 (the only good thing he did do). This isn’t about selective availability.
Here is a Wikipedia article on it
http://en.wikipedia.org/wiki/Effects_of_relativity_on_GPS
and one from an astronomy class lecture in 2006.
http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/gps.html