In what ways do the recent replacements differ from NAD 83 and NAVD 88? Check all that apply. Group of answer choices The National Geodetic Survey will discontinue the Continuously Operating Reference Stations (CORS). The new terrestrial reference frame will correct a discrepancy of about 2.2 meters between the origin of NAD 83 and the earth's center of mass. The National Geodetic Survey (NGS) will no longer maintain survey markers, which currently serve as datum "realizations." Improved geoid models will correct biases (~ 0.5 meters) and tilt (~ 1 meter coast to coast) that degrade measurements of heights with NAVD 88