Which of the following is incorrect about the Indian Regional Navigation Satellite System (IRNSS)?
1
It covers an area of about 1500 km around the Indian sub-continent.
2
It provides for two different types of services, restricted as well as open positioning services.
3
It has seven satellites in a constellation, all launched in the Geo-stationery orbit (GEO).
4
It is also known as Navigation Indian Constellation (NAvIC).