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A need was perceived in the Geological Survey of Finland in 1983 to improve the rapidity and accuracy of fieldwork methods based on traditional drilling methods. The possibilities offered by the Ground penetrating radar technique were then explored. The first measurements to be carried out by the Geological Survey of Finland, in 1983, employed a Swedish Markradar Ab device, and radar equipment from Helsinki University of Technology was tested in 1984. As the preliminary results were highly promising, the Geological Survey of Finland decided to purchase Ground penetrating radar equipment of its own in 1985. The Subsurface Interface Radar (SIR) by the American manufacturer Geophysical Survey Systems ic. was bought.