MANETs are a group of wireless computers in the form of communication network which do not have predetermined structure. Administration and configuration of these kinds of networks are not dependent on any special user. Approach: There are many problems in the creation of Mobile Ad hoc Networks, such as routing, wireless media, energy consumption, transportability and efficiency. Results: Although there are several routing protocol proposals for MANETs, applied sensitivity increase the importance of efficiency related considerations. For example in the case of military field activities, many industrial and vehicular control and monitoring applications some crucial efficiency parameters should be considered such as packet delivery ,shortest available path and routing overhead. In this paper we have investigated efficiency of the routing protocols (DSR, AODV, DSDV, TORA, FSR, CBRP and CGSR) so that an engineering methodology could be constructed depending on requirements, restrictions and availabilities. Conclusion/ Recommendation: We have also given details of efficiency comparison factors of the routing protocols used in seamless networks which yields these results. From the detailed simulation results and analysis, a suitable routing protocol can be chosen for a specified network and goal.