MSAS (Multi-functional Satellite Augmentation System)

MSAS, or Multi-functional Satellite Augmentation System, is a navigation enhancement service used primarily in Japan. It improves the accuracy, reliability, and integrity of GPS signals by broadcasting additional correction data through geostationary satellites. This helps users, such as pilots and travelers, obtain precise positioning information essential for safety and efficiency, especially in environments where standard GPS signals may be less reliable or accurate. Essentially, MSAS acts as a supplementary layer that refines GPS data, ensuring better navigation and situational awareness in various applications.