Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with a ship) A boat in a dream is salvation for one who is in hardship or worry. Riding it indicates following guidance or travel. Its sinking is a calamity.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
(By analogy) A boat indicates a wife, a child, or a short journey.
Source: Signs in the Science of Expressions (Ibn Shaheen)
(By analogy) A boat is interpreted as salvation and relief. Riding it indicates emerging from worry.