BeiDou Navigation Satellite System:

BeiDou-2 (formerly known as COMPASS) is not an extension to the older BeiDou-1, but rather supersedes it outright. 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.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What was BeiDou-3 formerly known as?
unanswerable