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@stevo_com
we used them as a surveying tool in archaeology. you would set up the station on a tripod and calibrate it based on known benchmarks. The prism is normally on a pole of a known height that another person would walk around with and place at points on the ground you wanted to know the exact location of including height above sea level. the data would then be fed into topographic modelling software and a plan of the area would be made.