Which GNSS system is still in development as of the latest information?

Galileo is indeed the correct choice as it is a global navigation satellite system (GNSS) that is still undergoing development and expansion. It is designed to provide high-precision positioning services across the globe, which is essential for various applications ranging from personal navigation to critical infrastructures. While Galileo has launched some satellites and provides limited services, it is actively enhancing its capability and coverage. The system aims to be fully operational with a larger constellation of satellites over the coming years.

In contrast, GLONASS and WAAS are fully operational systems. GLONASS is the Russian equivalent of the GPS system and has been functional for several years. Meanwhile, WAAS (Wide Area Augmentation System) is a system used primarily in North America to improve the precision of GPS signals and is also fully operational.

CORS (Continuously Operating Reference Stations) are not a GNSS on their own but rather a network of stations that provide accurate positional data and corrections to GNSS users. These systems are well-established and serve to enhance the utility of existing GNSS infrastructure rather than being in development like Galileo.