Some of these corrections apply to any location, the corrections to the clocks and ephemeris data for instance, but the billows cover only a certain portion of the sky so a correction measured at any one ground station is only really useful for receivers located nearby.
Some of these corrections apply to any location for instance. Any location is the corrections to the clocks and ephemeris data. The billows cover only a certain portion of the sky. A correction measured at any one ground station is only really useful for receivers. These receivers are located nearby.