We all heard of the continental drift phenomenon. I understand the 5 continents are moving a few meters/feet per year. Does the GPS satelite system have a correction algorithm ? If not, as years go by I would think that the same GPS coordinate does not locate the same place on earth.E.g : if my house doorstep is N 50°23.000 E 4°50.000, after a few years it could have become N 50°23.002 E 4°50.003, because of continental drift ? Thanks for your comments. David.