Japan launched their own satellites that have a high angle in the sky because of all the urban canyons that they have in major cities: > Instead, their ground

Japan launched their own satellites that have a high angle in the sky because of all the urban canyons that they have in major cities: > Instead, their ground traces are asymmetrical figure-8 patterns (analemmas), designed to ensure that one is almost directly overhead (elevation 60° or more) over Japan at all times. * https://en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System https://en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System This is also partly why more GPS signals (L2C, L5) were added: multiple signals at different frequencies from the same satellite allow for detecting atmospheric and multi-path issues: * https://en.wikipedia.org/wiki/GPS_Block_III#New_navigation_signals https://en.wikipedia.org/wiki/GPS_Block_III#New_navigation_s... * https://en.wikipedia.org/wiki/GPS_signals#Modernization_and_additional_GPS_signals https://en.wikipedia.org/wiki/GPS_signals#Modernization_and_...