OCSNCOE Logo Stormy sunset behind a floating OCS facility in the Green Canyon area of the U.S. OCS in the Gulf of Mexico


Mobile Offshore Drilling Units (MODUs)

mobile offshore drilling unit or MODU, as defined in 33 CFR 140.10, is "a vessel, other than a public vessel of the United States, capable of engaging in drilling operations for exploration or exploitation of subsea resources." [emphasis added]

Additional 33 CFR 140.10 definitions that also apply to a MODU include OCS facility (when in contact with the seabed of the OCS for exploration or exploitation of subsea resources), unit and vessel. §140.10 definitions that do NOT apply to a FOF include manned platform.

Please use the menu to the left or the links provided below to learn about MODUs and the U.S. Coast Guard oversight of these units:

  ○ Types of Mobile Offshore Drilling Units

  ○ Regulations, Policy and Guidance applicable to MODUs

  ○ Frequently Asked Questions (FAQs)