A Mobile Ad hoc NETwork (MANET) is a self-configuring infrastructure less network of mobile devices connected by wireless. Each device in a mobile ad hoc network is free to move independently in any direction, and will therefore change its connections to other devices very frequently. In geographic routing to forward a packet the authors need router's position and destination of packet. Location information is updated based on the beacon messages. Periodic broadcasting of beacon packets which contain the geographic location coordinates of the nodes is a most widely used method by most geographic routing protocols to maintain neighbor positions.