If the accuracy is down to half a centimeter , this is something that would need to be re-calibrated several times a year. The tectonic plates move over 1 cm pe

If the accuracy is down to half a centimeter , this is something that would need to be re-calibrated several times a year. The tectonic plates move over 1 cm per year, and any type of earthquake can shift land by significantly more than a half centimeter