The only thing that I am confident of is that the Trimble GPS were fixed and not measured autonomously. I checked on the survey report

Yah that sounds like it's going to be the sensible thing to do

Hi, may you please give me examples of software that I can use to do a local site calibration?

Hi Peter, I am very new at surveying and did not periodically check shots on the backsight. The surveying was done using the local South African LO-29...