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Ocean has roads
Roads across the sea (sea routes)
Aids to navigation
There are various kinds of aids to navigation in order to show ships their locations.
Lighthouse is one of them. It is easy for captains to identify the lighthouse even from a distance, because each of them has different way of lightening. When fog blocks the visibility, some lighthouses can notify ships by sound. Each lighthouse has different sound.
Electric-beacon Lighthouse can obtain the information about the location of ships by wireless applications. Some applications can calculate the location receiving the signal from satellites.
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