Which of the following is an SBAS that covers Japan?

The choice of MSAS as the correct answer is accurate because it specifically refers to the Multi-functional Satellite Augmentation System, which is designed to enhance the accuracy of GPS signals in Japan. MSAS provides critical corrections and reliability to satellite-based navigation systems, improving the positioning performance for users across the country.

In contrast, EGNOS (the European Geostationary Navigation Overlay Service) primarily serves Europe, while WAAS (the Wide Area Augmentation System) is designed for the United States and does not extend its coverage to Japan. CORS (Continuously Operating Reference Stations) is not an SBAS but rather a network of GPS reference stations providing differential correction data and is used mainly for surveying and geodesy.

Understanding that MSAS is uniquely tailored for Japan underscores its role and the importance of regional satellite augmentation systems in providing localized navigation accuracy.