Navigational marks used for informational or regulatory purposes are ____.

Navigational marks that serve informational or regulatory purposes are characterized by their distinctive design of being white with orange geometric shapes. This specific color scheme and pattern is crucial because it helps mariners identify certain types of communications related to navigation, such as regulatory markers indicating no-wake zones, speed limits, or restricted areas.

The use of white for the base color provides high visibility, while the orange shapes effectively draw attention and convey important information that is critical for safe navigation. This clear differentiation from other types of marks aids in reducing confusion and enhances navigational safety.

The other options represent different types of navigation aids: solid yellow is often used for mooring buoys, red and white vertically striped marks commonly indicate preferred channel routes, and green and red horizontally-banded marks are typically utilized as channel markers. Therefore, while those colors and patterns have their designated meanings, they do not fulfill the role of informational or regulatory markers as defined by the U.S. Coast Guard standards.