What is Outer Continental Shelf Activity?
Outer Continental Shelf Activities and Mobile Offshore Drilling Units (MODU) are accountable to the regulations found in Title 33 CFR, parts 140-147 (Subchapter N). According to Rule 3 Mobile Offshore Drilling Units (MODU) are not considered underway when drilling because they are attached or made fast to the bottom. That being established, requirements for MODUs can be found in Title 33 CFR, part 67.05, Aids to Navigation on Artificial Islands and Fixed Structures. MODUs fall under the definition of structures which includes drilling platforms and barges.
