Several countries and blocs have developed or are developing their own satellite navigation systems. These include the United States' GPS, Russia's GLONASS, the European Union's Galileo, and China's BeiDou. Japan has also developed its own system, known as the Quasi-Zenith Satellite System (QZSS), which is designed to enhance GPS coverage and accuracy in Japan and the Asia-Oceania regions, particularly for time-sensitive applications like disaster management and autonomous driving.