Which of the following is NOT a requirement for vessels intentionally discharging oil?

The correct option indicates that a vessel intentionally discharging oil does not require being anchored. In the context of maritime regulations, especially those stemming from conventions such as MARPOL (International Convention for the Prevention of Pollution from Ships), specific conditions must be met for vessels discharging oil. Among these, the vessel should generally be en route or in a situation where discharging oil is permissible under certain conditions.

When a ship is anchored, it is often subjected to stricter oversight regarding discharges, as it is in a stationary position and any discharge can pose a higher risk of environmental contamination. Additionally, there are stringent regulations surrounding the types of oil that can be discharged and the circumstances under which this can occur. Therefore, the requirement for the vessel to be en route emphasizes the need for operational status and suitable conditions for discharges of oil within legal limits, highlighting that being anchored is not a requirement for such activities.

In this framework, the other listed options pertain to specific conditions that must be met if a ship is to be compliant when intentionally discharging oil. The oil’s source (such as being from the cargo pump room bilges), the need to ensure it is not mixed with oil cargo residue, and additional operational parameters are stipulations designed to minimize