December 8, 2016 Directions 2017: New GLONASS capabilities for users By Sergey Karutin, Nikolay Testoedov, and Andrey Tulin
December 7, 2016 NGS to replace NAVD 88 in 2022: What GNSS users need to know — Part 10 By David B. Zilkoski
![[FIGURE 1] New Datums: Approximate Orthometric Height Change](https://stage.gpsworld.com/wp-content/uploads/2016/12/Fig1-datum-NGS-ortho-height-change.jpg)
