Please correct me if I'm wrong. Taking backsight observation is a process of aligning your horizontal circle. This is to make sure of the coordinate system consistency in the entire project. I guess that there is a unique case that you don't need to perform backsight observation for as long as you're very sure of backsight point information. Setting up fresh a total station is having its horizontal circle not correctly oriented. Horizontal angle difference or angle correction can be derived…See More

I am wondering how tilt compensator really works. Is it relative to the current plumbline or to the initial plumb line? I am asking this simply because anxiety is really there when my TS tilts over point occupation time. This is a reality that we can't avoid. Our TS really tilts over time due to many factors. As it tilts, plumb line shifts. My question is where tilt compenstation is made relative to? If it is made relative to the initial plumb line then it is a great relief for me and I don't…See More