Mobile ad hoc networks (MANET) are characterized by multi-hop wireless mobile nodes that communicate with each other without centralized control or established infrastructure. There are various challenges in MANET such as routing, dynamic topology, scalability, bandwidth optimization. But the major challenge in MANET is link failure due to high mobility. Topology-Based routing protocols become unsuitable for MANET when the nodes are highly mobile and topology changes dynamically. Geographic routing protocols are regarded as efficient and scalable when mobility is high. Therefore, geographic routing protocols have attracted a lot of attention in the field of routing protocols for MANET. This paper gives comparison of various geographic routing protocols such as Location-aided Routing (LAR), Distance Routing Effect Algorithm for Mobility (DREAM), Greedy Perimeter Stateless Routing (GPSR), Energy Aware Geographic Routing (EGR) on the basis of performance metrics such as network lifetime, delay, delivery ratio and energy consumption using NS2. Simulation result shows that EGR shows high delivery ratio and network lifetime than other geographic routing protocols.