In geographic information systems the reversibility of map update operations have not been explored yet. In this paper we are using the Voronoi based quad-edge data structure to define reversible map update operations. The reversibility of the map operations have been formalised at the lowest level, as the basic algorithms for addition, deletion and moving of spatial objects. Having developed reversible map operations on the lowest level, we were able to maintain reversibility of the map updates at higher level as well. The reversibility in GIS can be used for efficient implementation of rollback mechanisms and dynamic map visualisations.