Visit this site http://util-locate.com/utility-locating/ for more information on sewer locator. Underground utility mapping using advanced technologies is the need of the day like the sewer locator because we do not want to damage the already existing sewer when the digging of the ground is going on. There are utility pipes like sewers, etc below the surface. Anywhere you plan to dig up for construction or other projects, you are likely to encounter pipes.