Maritime wireless communication establishment in the seas of Indonesia has already been under investigation. It is useful for supporting some activities in the sea, such as monitoring and surveillance, fishery, and exploration. Propagation characteristics in maritime environment is different from one in the land therefore needed to be studied more. One important aspect in maritime radio propagation is path loss caused by sea movement. Sea movement in the seas of Indonesia varies from smooth to rough according to Douglas sea scale. The rougher the sea movement, the severer the path loss that happens in radio propagation. In this paper, the effect of path loss to the performance of wireless communication in maritime environment is investigated. Simulations based on some scenarios of propagation are also performed and analyzed.