Historical clue formulations

• Indian Ocean vessel — 2011-01-05
• Persian Gulf craft — 2003-06-08
• Boat on the Indian Ocean — 2003-03-24
• Red Sea vessel — 2001-12-20
• Arabian sailing vessel — 2001-11-11
• Indian Ocean vessel — 2000-06-25
• Lateen-rigged boat — 1996-02-04
• Lateen-rigged boat — 1995-07-06
• Gulf of Aden vessel — 1995-03-28