Completely revised and updated, this third edition reflects the increased importance of GPS in the everyday practice of surveyors and mappers. Providing an accessible yet rigorous introduction to the subject, the book offers a practical guide to the techniques used in real GPS surveying. It explores advances in the field, covering new topics such as block IIF and control segment modernization. From the design of a GPS survey to observation and post-processing, this book presents an overview of GPS modernization and explains the fundamentals of GPS codes such as TRANSIT. The text also features an in-depth discussion of the global navigation satellite system (GNSS).