PowerMac: A new protocol design for location based Ad-hoc networks A mobile ad hoc network (MANET) is one consisting of a set of mobile hosts which can operate independently without infrastructure base stations. Power saving is a critical issue for MANET since most mobile hosts will be operated by battery powers. We can apply power conservation methods in all layers; but most of the power control mechanisms are working in MAC layer. Media access control is an essential part of the wireless communication stack and it has obtained intensive research attention. In this paper I will try to design a MAC protocol for reducing the power consumed by each and every node. This is achieved by position based routing with the help of GPS system of the nodes.