Coverage is the area the satellite can see while it can be seen from the ground station.
In 1990, according to NOAA, more than 5000 stations, established in at least 123 countries, received APT data from U.S. and U.S.S.R. satellites. APT signals from U.S. satellites are transmitted on 137.50 or 137.62 MHz. APT data are acquired whenever a POES passes within range of a ground station, at least four times in a 24-hour period. The data rate is 33,280 bps. Resolution is 1 km at nadir and about 0.7 C accuracy on sea surface temperature.