257.Which one of the following countries has its own Satellite Navigation System?

Austratia
Canada
Israel
Japan

The correct answer is (d), Japan.

Japan has its own satellite navigation system called Quasi-Zenith Satellite System (QZSS). It is a four-satellite system that provides high-precision positioning, navigation, and timing services in Japan and the Asia-Pacific region. The first QZSS satellite, Michibiki-1, was launched in 2010, and the fourth and final satellite, Michibiki-4, was launched in 2017.

QZSS is a regional satellite navigation system that is designed to complement the global navigation satellite systems (GNSS) such as the Global Positioning System (GPS) and the Galileo system. QZSS satellites are in geostationary orbit, which means that they appear to be stationary in the sky from the perspective of an observer on the ground. This makes QZSS particularly well-suited for applications that require high-precision positioning, such as aviation and maritime navigation.

QZSS is also used for a variety of other applications, such as disaster response, asset tracking, and precision agriculture. The system is expected to be fully operational by 2023.

The other options are incorrect because they do not have their own satellite navigation systems. Australia, Canada, and Israel all use GNSS for positioning, navigation, and timing.