How must the registration number color contrast with the background?

The registration number on a boat must be distinctly visible and legible to ensure that it can easily be read from a distance. This visibility is crucial for safety, law enforcement, and identifying ownership. A contrasting color between the registration numbers and the background helps achieve this requirement, making it easier for others, including patrolling authorities, to see and identify the vessel.

Choosing any color for the registration numbers does not guarantee visibility, especially in various lighting conditions or against different backgrounds. Similarly, while dark colors can be effective in some instances, they are not universally appropriate. Reflective materials, although beneficial for visibility at night, are not a mandatory requirement for the color contrasting with the background; the primary objective is clear legibility and visibility in all conditions.