A method for monitoring entities moving in a monitored space represented by a first digital model comprising a set of maps with different levels of granularity representing a fineness of the requested monitoring, each map being divided into geographical zones of a predetermined shape, and having a size defined according to the level of granularity, the method including: - an identification step for identifying geographical zones of each map in the form of a complete address, so as to identify each geographical zone uniquely, - a definition step for defining operational zones (24a, 24b) and associating each operational zone (24a, 24b) with a predefined level of granularity, - a configuration step for loading a set of data relative to the geographical zones associated with the maps of different levels of granularity, and with the operational zones (24a, 24b), - a positioning step for positioning the entity, so as to determine the geographical coordinates of the monitored entity, - a determination step for determining a level of granularity to be applied, as a function of the geographical coordinates of the monitored entity, - a determination step for determining a geographical zone, from a map with the predetermined level of granularity, containing the entity, - a detection step for detecting a change of zone as a function of the geographical coordinates of the monitored entity, the monitored entity either going from an original geographical zone to a destination geographical zone without changing operational zones (24a, 24b), or from an original operational zone (24a, 24b) to a destination operational zone (24a, 24b), and - an application step for applying a new level of granularity as a function of the operational destination zone (24a, 24b), in the case of a change of operational zone (24a, 24b), characterized in that: - the determination steps (135, 138), the detection step, and the application step are carried out within each entity, independently, without outside communications, - the method comprises a broadcasting step for broadcasting by a monitored entity to other entities of a message including geographical zone information, the geographical zone information including a direction indication. - an identification step for identifying geographical zones of each map in the form of a complete address, so as to identify each geographical zone uniquely, - a definition step for defining operational zones (24a, 24b) and associating each operational zone (24a, 24b) with a predefined level of granularity, - a configuration step for loading a set of data relative to the geographical zones associated with the maps of different levels of granularity, and with the operational zones (24a, 24b), - a positioning step for positioning the entity, so as to determine the geographical coordinates of the monitored entity, - a determination step for determining a level of granularity to be applied, as a function of the geographical coordinates of the monitored entity, - a determination step for determining a geographical zone, from a map with the predetermined level of granularity, containing the entity, - a detection step for detecting a change of zone as a function of the geographical coordinates of the monitored entity, the monitored entity either going from an original geographical zone to a destination geographical zone without changing operational zones (24a, 24b), or from an original operational zone (24a, 24b) to a destination operational zone (24a, 24b), and - an application step for applying a new level of granularity as a function of the operational destination zone (24a, 24b), in the case of a change of operational zone (24a, 24b), - the determination steps (135, 138), the detection step, and the application step are carried out within each entity, independently, without outside communications, - the method comprises a broadcasting step for broadcasting by a monitored entity to other entities of a message including geographical zone information, the geographical zone information including a direction indication.