What is NAVSTAR?

NAVSTAR is the original name given to the Global Positioning System (GPS) that is operated by the United States government. It stands for Navigation System with Timing and Ranging, and it is a satellite-based navigation system that provides location and time information in all weather conditions, anywhere on Earth. The system was developed by the U.S. Department of Defense and is widely recognized for its military and civil applications.

Given the context of the other choices, the European GPS system refers to the Galileo system, which is independent of the U.S. system. The Russian GPS system is known as GLONASS, and the Indian GPS system is referred to as NavIC (Navigation with Indian Constellation). Therefore, NAVSTAR, specifically relating to the U.S. GPS system, is accurately represented by the correct answer.