question: What is the purpose of the BeiDou-1 system using stallites in geostationary orbit ?
answer: the system does not require a large constellation of satellites
turker_answer: The purpose of the BeiDou-1 system using stallites in geostationary orbit is because the system does not require a large constellation of satellites .
rule-based: The purpose of the BeiDou-1 system using stallites in geostationary orbit is the system does not require a large constellation of satellites .