ANSWER: None
Explanation:
- The People's Republic of China is developing its own SBAS, called Satellite Navigation Augmentation System (SNAS).
- The MTSAT Satellite Augmentation System (MSAS) is the Japanese Satellite Based Augmentation System (SBAS) System
- The System for Differential Corrections and Monitoring (SDCM) is the SBAS currently being developed in the Russian Federation as a component of GLONASS.
- The Wide Area Augmentation System (WAAS) is the United States Satellite Based Augmentation System.