Ships at sea are to navigate safely. There are many instruments for safe navigation. Buoy, Lights and light house are common of them. these (in photos) buoy, light and Light house are at the Karnaphuly river mouth and at Patenga light house. There is a rule in navigation, i.e.“Green to green red to red, safety perfect go ahead”. It means a ship will cross another showing green to green or red to red to each other and it will be safe for both the ships.
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