A Friend Is a Treasure - 1981

Alan understands a map to some war treasure that the Japanese army left behind by the ending of World War II. However, some gangsters decide to attempt to slip the map from him and so he hides on Charlie's ship that leaves the sanctuary. He manipulates the compass of the ship that Charlie is not aware he is drifting to the treasure island. Nevertheless when they step on the island, they find since they believed, that It's not as abandoned: You can find some natives - and a soldier nonetheless defending the treasure