Near part of the west coast, there are fairly large effects due to plate tectonics (centimeters per year). I would think western California must have a measurem

Near part of the west coast, there are fairly large effects due to plate tectonics (centimeters per year). I would think western California must have a measurement system whose position relative to points on the east coast gets adjusted periodically, with various deeds recording positions relative to ‘fixed’ points near the west coast.