This book is a compilation of chapters that discuss the most vital concepts in the field of satellite navigation or global navigation satellite systems. It explores all the important aspects of this field in the present day scenario. Satnav is the technology which uses satellites to provide particular locations. It uses time signals emitted by radio to determine the exact longitude and latitude of areas and also provide altitude of the same. It is used for geo-spatial positioning. It is applied in Global Positioning Systems (GPS) worldwide and is being used by many different countries for their military and security purposes. While understanding the long-term perspectives of the topics, the book makes an effort in highlighting their impact as a modern tool for the growth of the discipline. It presents the complex subject of satellite navigation in the most comprehensible and easy to understand language. This textbook is appropriate for those seeking detailed information in this area.