 Redundancy can be achieved by launching a large number of satellites, which is a practical solution for things like the Global Positioning System (GPS) because each vehicle occupies a slightly different orbit.This is not possible for geosynchronous orbit, where all functions must be accomplished by one vehicle that performs all functions must maintain stable position over one specific spot over the earth surface.Satellites intended to operate in geosynchronous orbit must incorporate active recovery that prevents total failure when one or more parts fail.