Route request (RREQ) message is flooded to find a route in ad-hoc on-demand distance vector (AODV) routing protocol. This flooding of RREQ generates severe overheads in a maritime multi-hop ad-hoc network (MMANet) due to limited small bandwidth. In this paper, to improve the throughput of bandwidth-limited MMANet, we propose a geographical AODV (GAODV) protocol. The key feature of the GAODV is the selective broadcast of RREQ using position information. The routing overhead-traffic of the GAODV is smaller than that of AODV. This routing overhead-traffic reduction of the GAODV is more increased as the density of ship increases.
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