In addition to being visually striking, why should registration numbers contrast with their background?

Registration numbers should contrast with their background primarily to make them visible. This visibility is crucial for safety and compliance purposes. Properly contrasting colors ensure that the registration numbers are easily readable from a distance and under various lighting conditions. This helps law enforcement, other boaters, and emergency responders identify the vessel quickly.

While aesthetic appeal can be a consideration for some boat owners, the primary function of the registration number is to ensure that the boat can be easily and accurately identified. Factors such as durability and fading are important for the longevity of the numbers, but they do not directly relate to the need for contrasting colors that support visibility. Ensuring that the registration numbers stand out emphasizes the importance of effective communication on the water, where visibility could be critical for safety and legal identification.