It was an interesting time when WGS 84 was being introduced and we found that all the individual country's surveys did not quite connect - sometimes by a few metres and sometimes by many miles
Was involved in hydrographic survey in '73 and sections had not been surveyed since the time of discovery by Captain Cook in 1770. What surprised was generally how accurate he was given the technology of the time. Also spent time chasing errors in the national data base. Know nothing of the subject, I was just the means of transport and dogsbody carrying equipment.