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In our advanced world there is so much going on beneath the ground and if one wants to launch a building venture it is important to find out whether this is secure not only above the ground. A lot of harm can happen if any kind of unpredicted utility locating gets hit and the outcomes may not just be of the financial kind but, much worse, can injure people. Therefore good organisation and secure underground mapping are one of the most important tasks that need to be coordinated before the beginning of the first works on a building area. Mostly common utility mains require to be identified and duly marked for the building workers and diggers to avoid. And there are so many of them, including phone or TV lines and all kinds of communication and electricity mains, to name the least harmful. Then there are the much more critical encounters below the ground which require to be handled with the greatest attention, like water and gas pipelines, but even oil pipelines can be found; and all of these must be marked with dependable underground utility mapping. A further risk are storm drains or water mains, but also pipes for wastewater or gatherings of natural gas. In urbanized stretches, though not exclusively, the space below the ground could be already taken by railway tunnels or tunnels for mass transit. So, to see and properly chart such lines and underground obstacles several methods can be used by cartographers. Diverse sorts of materials utilized in these utilities call for various techniques that can detect and locate very precisely all the underground mains. Electromagnetic radars are one option, radiolocation used along with GPR equipment are another. In order to get an utterly perfect location job done, it is mostly inevitable to apply all of the different methods, and it is essential to always get the latest underground maps done because even beneath the ground things are in a continuous move and in many cases poorly documented.