December 28, 2016 Teledyne Optech launches static, mobile surveying solutions at Intergeo 2016 By Joelle Harms
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://www.gpsworld.com/wp-content/uploads/2016/12/Fig1-datum-NGS-ortho-height-change.jpg)
