Surveying has become a high-tech discipline. Today we com-monly use global positioning systems (GPS) for control networks and monitoring. However, many surveyors are still sceptical about its use for construction staking. There is legitimate concern over the heights or elevations returned by GPS receivers. We believe these can be managed with appropriate network design and project calibration. A little over a year ago, our firm (Nasland) was considering buying GPS receivers. Real-time kinematic (RTK) equipment was just being released for the general surveying community. We went ahead, but it has taken some time to develop faith in a tool in which you cannot see or feel any part of the element being measured.
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