This subpart applies to all U.S. and foreign vessels, except those U.S. vessels traveling directly from a U.S. port or place, or from an OCS block area, bound for a place on the OCS and planning to engage in OCS activities. Vessels under this subpart include, but are not limited to, standby vessels, attending vessels, offshore supply vessels, pipelay vessels, derrick ships, diving support vessels, oceanographic research vessels, towing vessels, and accommodation vessels. This subpart does not apply to MODUs, which are covered under § 146.215; nor does it apply to floating facilities, which are covered under §§ 146.103 and 146.104.