I want to know the answer to the following question:
What is the purpose of the geostationary orbit satellites in the BeiDou-2 system?
All the background I'm provided with is that "The new system will be a constellation of 35 satellites, which include 5 geostationary orbit satellites for backward compatibility with BeiDou-1, and 30 non-geostationary satellites (27 in medium Earth orbit and 3 in inclined geosynchronous orbit), that will offer complete coverage of the globe.". Is that enough to answer the question?
Answer: yes