Lucid descriptions of Global Navigation Satellite Systems (GNSS) are provided in this thorough and reader-friendly book. GNSS plays a significant role in high accuracy navigation, positioning, and technical questions connected to accurate positioning. It is an extremely accurate, constant, all-weather and real-time method. This book presents current outcomes and innovations in GNSS technology, organization, signal, receiver, technique and sources of error. Its various functions in hybrid positioning, multi-sensor incorporation, height system, NRTK, etc. have also been evaluated and analyzed. This book intends to help experts and students in knowing the topic in a better way.