ter made a special effort to include comprehensive coverage of the topic. Finally, the focus switched to the current state of play with network management and automation, an area where you can see that PTP still has some work to do. And the chapter would not be com- plete without some additional details of the day-to-day operations and management of a timing solution, including some details on difficulties that can arise with GNSS receivers and antennas. 12.7 Conclusion Congratulations for making it to the end of the book, although there is no expectation that readers could have (or should have) read every section. The goal of the book was to cover a great breadth material-more than most readers would need-and in enough depth to suit just about everybody. Of course, the idea was to introduce the topic from a very low level of understanding and point you in the right direction should you need to go further. This book has a been both a labor of love and a welcome distraction for the authors during a very difficult year for many people, both locally and globally. First and foremost, we wanted to make something available to the timing community that is chiefly educational and informative. Our greatest reward would be that it helps you both in your learning and when undertaking future projects. References Chapter 1 Bizouard, C. "Information on UTC - TAI." International Earth Rotation and Reference Systems Service (IERS), Bulletin C 61, 2021.https://datacenter.iers.org/data/latestVersion/16_BULLETIN_C16.txt IEEE Standards Association. Annex B, "Timescales and Epochs in PTP," from "IEEE Standard for Precision Clock Synchronization Protocol for Networked Measurement and Control Systems. IEEE Std. 1588:2008. https://standards.ieee.org/standard/1588-2008.html Sobel, D. Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time. New York: Walker, 1995. The 13th Conférence Générale des Poids et Mesures. "Resolution 1 of the 13th Conférence Générale des Poids et Mesures (CGPM)." The Inte