Regulatory or informational markers are used to advise you of situations, dangers, or directions. They may indicate shoals, swim areas, speed zones, etc. They can be easily identified by the white color with orange geometric shapes.
Explanation may be placed outside the crossed diamond shape, such as dam, rapids, swim area, etc.
The nature of danger may be indicated inside the diamond shape, such as rock, wreck, shoal, dam, etc.
Type of control is indicated in the circle, such as slow, no wake, anchoring, etc.
May show white light and/or may be lettered.
For displaying information such as directions, distances, locations, etc.