Biggest by Gross Weight (interior volume): Momentum: Starting today, January 30, 2024, the title of biggest boat by gross weight has a place with Regal Caribbean's Symbol of the Oceans ship has set sail from the US state of Florida on its maiden voyage. Sent off in January 2024, it brags a gross weight 248,336, surpassing the past record holder, Desert spring class ships, by around 24,000 GT.