Meaning of application of technologies of geodetical and cartographic works in the processes of state border demarcation works shall be considered as the first main technical position in the course of their practical realization and maintains its importance also in further border maintenance measures. On 21 February, 1994, the agreement was concluded in order to determine Latvian – Belarussian state border, Mixed Border Demarcation Commission was formed. In 2015, Latvia concluded with Belarus State Border Regime Agreement, where they agreed on maintenance of the joint border. As every geodetic system, also it accrues deviations from the original parameters. It is stated that the earlier established system does not comply not only with requirements of completion of works of contemporary geodesy, but also with criteria determined during the establishment. The study concerns Latvian – Belarussian state border in the framework of fulfilment of the concluded border maintenance agreement 2016 – 2018.