Final answer:
The vessel's registration number and validation decal should be prominently displayed on both sides of the bow, in visible contrasting colors and kept up-to-date with any changes in information well-documented.
Step-by-step explanation:
The vessel's registration number and validation decal should be displayed in an area where they are clearly visible on the bow of the boat. Typically, the registration number is to be placed on the forward half of the vessel, on both sides, and in a position where it can be easily seen. The number should be in bold block letters that contrast with the color of the boat, and the letters should be separated from the numbers by a space or a hyphen. The validation decal should be affixed near the registration number, usually within six inches. It's important to ensure all information is legible and matches the details on the official documents, such as the driver license or ID card. If there is a change in address, it should be documented on a small piece of paper with your signature and date, and kept with the relevant identification.