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Acknowledgements The writing of these guidelines has involved a myriad of resources. Besides the author's personal experience with different manufacturers' hardware and software for classical real-time (RT) Global Navigation Satellite Systems (GNSS) positioning for over a dozen years, the internet was the primary source for definitive documents and discussions. Additionally, many agencies have published single-base guidelines of some sort over the years to aid their users in the application of the technology and to provide consistency with the results. The following are gratefully acknowledged as sources for research and information: • National Geodetic Survey (NGS)– publications and internal documents The author wishes to especially recognize two individuals who have brought tireless encouragement, education and support to all they touch. Alan Dragoo introduced the author as a much younger man to GPS many years ago and remains a readily accessible source of practical knowledge for so many. Dave Doyle has taken geodetic knowledge from the text books and made it understandable and practical to everyone for decades. Both are what it means to be a true professional and to give back of themselves to our rich geospatial heritage.