Bed on Board is a term used to describe a sleeping accommodation on a boat or other vessel. It is also known as a BERTH, which is a five-letter word that can be used to solve a crossword puzzle. A BERTH is a bed or bunk that is built into the structure of the boat and is typically used by crew members or passengers. Bed on Board is a convenient way to sleep while on a boat, as it eliminates the need to bring a separate bed or mattress.