context: Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are visible. The area that can be serviced is from longitude 70°E to 140°E and from latitude 5°N to 55°N. A frequency of the system is 2491.75 MHz.
question: భూస్థిర కక్ష్యలో స్టాలైట్లను ఉపయోగించి బీడూ-1 వ్యవస్థ యొక్క ప్రయోజనం ఏమిటి?
answers: the system does not require a large constellation of satellites