Public utility bodies have always been map users. Utility infrastructures need to be accurately positioned onmaps innorder to provide the best service to customers and for utility management. Utility bodies wanta quick and cont -effective tool to map the facilities they manage. the conventional method of positioning is very slow and time-consuming. Certainly a new technology,such as the Global Ppositioning System (GPS) will help utility bodies to perform such mapping tasks. the main aim of this study is to utilize the advent of GPS in utility mapping using differential techniques. The report reviewed various aspects of GPS ranging from their basic concept to GPS surverying techniques in order to measure and understand the full benefits of the GPS system. Also described are some of the advantages, disadvantages of GPS positioning techniques and thieir limitations. In exposing and addressing the greatinnovation of GPS technology, the base station concept is discussed in Chapter Eight, highlighting enormous consequences to users. One of the interesting consequences is that single single receiver users are ble to determine relative positions with greater accuracy, at lower cost. Two GPS surverying modes are investigated during the study. The first mode used two identical receivers while the second method incorporated hybrid receivers, processing through the RINEX format. The seamless GPS data are then overlaid using CAD software packages to produce the final output. The significant consequences of the output is that differential GPS using hybrid receivers seems to be cost-effective and adequate for utilility mapping andan effective method of data acquisition.