I forgot to post this link several months ago.
We utilized two reach units to derive GCPs for a UAV survey as well as to monitor the deformation at a slow-moving landslide in southwest Colorado.
All of the data, methods, and results are in the published work at the link below. It’s open access.
We compared in situ gnss results to motion derived from high-resolution spaceborne radar satellites. We also compared the reach results to uav/airborne lidar surface models. It was a great project!