189. In accordance with 33 CFR Subchapter O (Pollution), which of the following operations aboard a tanker must be recorded in the Oil Record Book on a tank-to-tank basis according to Coast Guard Regulations?

According to 33 CFR Subchapter O, all operations—discharge of machinery space bilge water, loading/unloading of oil cargo, and internal transfer of oil cargo—must be recorded in the Oil Record Book on a tank-to-tank basis for tankers.