Special markers are not primarily intended to assist navigation, but are used to indicate a special area or feature (i.e., traffic separation, anchorage areas, dredging, fish net areas, etc.) whose nature may be apparent from reference to a chart or other nautical document.
Cal. Code Regs. Tit. 14, § 7002.1
Note: Authority cited: Section 659, Harbors and Navigation Code. Reference: Sections 650, 655.3, and 659, Harbors and Navigation Code.