Location Based Services play an important role in decision-making processes, company activities or in any control and policy system in modern computer organizations. Usually LBS applications provide location-specific information only when user requests it. However, Supply Chain Management applications require to push geolocalized information directly to the user. The most discussed and requested application is Geofencing, which allows to determine the topological relation between a moving object and a set of delimited geographical areas. This paper describes the design of an innovative solution for implementing proactive location-based services suitable for application scenarios with strong time constraints, such as realtime systems, called Proactive Fast and Low Resource Geofencing Algorithm.