1.   His account is backed up by well-executed charts of the voyage that focus on the navigational problems mastered by Ellen Creesy.

2.   The navigational problems were first reported Friday by The New York Times.

3.   When the ship experiences navigational problems, Leo escapes to Gehenna Rocks, a desolate island, in a stolen lifeboat.

4.   He said the rest would be destroyed to ensure there would be no navigational problems for fishing vessels and other ships in the region.