Nice example. GPS is another case; to get the most out of the data requires very careful modeling, including tidal effects, Earth mass density, and GR correcti

Nice example. GPS is another case; to get the most out of the data requires very careful modeling, including tidal effects, Earth mass density, and GR corrections. (E.g., https://gipsy-oasis.jpl.nasa.gov/index.php?page=software https://gipsy-oasis.jpl.nasa.gov/index.php?page=software)