Machinery Space {Ans: Any enclosed space that either contains an installed internal combustion engine, machinery, or systems that would raise the ambient temperature above 45 degrees Celsius (113 degrees Fahrenheit) in all environments the vessel operates in.}Safety Management System (SMS) {Ans: A structured and documented system that enables personnel involved in vessel operations or management, as identified in the SMS, to effectively implement the safety and environmental protection requirements of this subchapter, and is routinely exercised and audited.}Oceans route {Ans: More than 20 nautical miles offshore on any of the following waters: (1) Any ocean. (2) The Gulf of Mexico. (3) The Caribbean Sea. (4) The Bering Sea. (5) The Gulf of Alaska. (6) Such other similar waters as may be designated by the cognizant Coast Guard District Commander.}Subchapter M Applicability {Ans: Applicable to all U.S.-flag towing vessels engaged in pushing, pulling, or hauling alongside, EXCEPT— *A vessel LESS than 26 feet; UNLESS that vessel is pushing, pulling, or hauling a barge that is carrying oil or Hazmat in bulk *A vessel engaged in one or more of the following: (i) Assistance towing (ii) Towing recreational vessels for salvage; or (iii) Transporting or assisting the navigation