The GPS Aided Geo Augmented Navigation or GPS and Geo Augmented Navigation system is a planned implementation of a regional Satellite Based Augmentation System by the Indian government. It is a system to improve the accuracy of a GNSS receiver by providing reference signals.The Rs. 7.74 billion project is being implemented in three phases through 2008 by the Airport Authority of India with the help of the Indian Space Research Organization's technology and space support. The goal is to provide navigation system for all phases of flight over the Indian airspace and in the adjoining area. It is applicable to safety-to-life operations, and meets the performance requirements of international civil aviation regulatory bodies. The final, operational phase of GAGAN is likely to be completed by May 2011. Gagan is the transliteration of a Hindi/Sanskrit word for the sky.

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