This paper is of a cognitive and research nature. The subject of the paper is to analyze one of the factors affecting the accuracy of the determination of the area of a cadastral plot, using the newer generation of handled Garmin GPSmap62st receiver. The research objective of the authors was to find the influence of the size of the cadastral plot on the measurement error of the area, using a manual GPS receiver and thus on the accuracy of the determination of the area of the plot. In the area two plots of different sizes (0.5 ha and 1 ha), was taken into account, and then repeated measurements were performed for those plots. Verification of the reliability of the results of the measurements was made on the basis of an analytical method of determining the area of those plots from coordinates. The area of the plots, measured by using the method called “footprint” based on fieldwork with the Garmin receiver, compared with the area of plots calculated analytically in the local system, and then calculated to determine the relative errors of these areas. For the purpose of the field work the configuration of the receivers was adopted to ensure the highest possible accuracy of measurements. Furthermore, an external antenna was used to make measurements more accurate. The calculations were performed with WinKalk software and for the presentation of measurement results BaseCamp software were used.