Construction surveyors measure, inspect, update, and document property boundaries using specialized surveying instruments, GPS (global positioning systems), and GIS (geographic information systems) technologies. They survey the site to gather information, provide precise measurements, and create digital maps and detailed reports. A construction surveyor advises clients, architects, and construction managers of any on-site conditions they should be aware of and performs layout work. Construction surveyors often work with construction companies or real estate development firms and split their time between construction sites and an office environment.