All stakes, casings, pipes, and buoys, except bamboo poles and wooden stakes less than 2 inches in diameter, placed in the water to facilitate seismographic or surveying operations shall be marked, in the manner prescribed by the District Commander, for the safety of navigation.
source: CGFR 58-17, 23 FR 3377, May 20, 1958, unless otherwise noted.
cite as: 33 CFR 67.15-5