CFR TITLE 33, Chapter 1, Parts 173-183 These sections apply to vessels that meet the definition of "recreational submersible" or "recreational vessel" within USCG NVIC 5-93 and 46 USC 2101.    Part 173    Vessel numbering and casualty and accident reporting    Part 174    State numbering and casualty reporting systems    Part 175    Equipment requirements    Part 177    Correction of especially hazardous conditions    Part 179    Defect notification    Part 181    Manufacturer requirements    Part 183    Boats and associated equipment