In this article, the authors consider the functional characteristics of autonomous platforms for various purposes and, in particular, ground autonomous platforms for military use with their specific requirements. At the forefront of the study is the ability to plan the platform’s path without using the existing road network and with maximum use of the characteristics of the terrain for covert movement vis-à-vis the position of an enemy observer. A methodology for creating a test environment with the application of an open-source software tool and a system for developing functional extensions (plugins) is presented. The mathematical bases for data processing for the altitude of the earth’s surface in determining the slope and the conditions for visibility are presented. A digital experiment for trajectory planning with the application of digital data for the height of the earth’s surface was performed. The experiment clarifies the initial data structures and the applied algorithms for trajectory planning in the conditions of hidden movement. Finally, the authors evaluate the achieved results and outline directions for further research.