As a basic principle, geodata are gathered through printed maps and handwritten records. In this process, deficient positioning and difficult-to-read comments in the map image. To minimize these sources of errors, this master's thesis investigates the approach of gathering and processing geodata with mobile geo-information systems and the support of GPS. For this research, several types of mobile devices as well as different software packs were applied. ESRI-products, such as ArcPad, but also free apps, such as „Locus Map Free Outdoor-GPS“, were used. The working basis for this research is a self-made workflow, which reflects the basic work steps of a mobile data-gathering project inside a small or medium business. The first chapters deal with the theoretical fundamentals of mobile GIS and related technologies, such as Distributed GIS or GPS. Afterwards, possible applicable devices and software solutions will be examined thoroughly. Subsequently, the necessary work steps and the execution of the data-gathering campaigns will be described, with special regard to the suitability of the mobile devices and software used. All necessary work steps inside the software packages applied will be described and analysed critically. Aside from the gathering and updating of geodata, their visualisation will also be examined. All in all, it can be said that in the work environment of a medium or small business, the user value of mobile GIS is quite high. They are especially suitable for editing existing projects or gathering new features. A decimation in the user value of mobile GIS manifests itself in the initial data-gathering of complete networks of hiking trails or cycling tracks, since the amount of time necessary for the inspection is too high. Concerning the visualisation of geodata, how-ever, mobile GIS play an important role, since they make the geodata accessible to the general public via mobile devices such as smart phones or tablets.