The immersion suit requirements for OSV apply to units operating in the Atlantic Ocean __________.

Correct Answer: Option D — above 32 degrees North and below 32 degrees South

46 CFR 133.70 mandates immersion suits for Offshore Supply Vessels operating in the Atlantic Ocean north of 32 degrees North latitude or south of 32 degrees South latitude. These specific geographic boundaries are established to mitigate the risk of hypothermia in colder waters where survival times are significantly reduced.