Compliance is required to be demonstrated at annual/intermediate,
periodic and unscheduled surveys or following a substantial modification
as per the NOx Technical Code, paragraph 1.3.2.
In accordance with the NOx Technical Code, paragraph
2.3.4, data is required to be current; that is within 30 days.
Data is required to be retained on board for at least three months.
These time periods should be taken to be when the ship is in operation.
Data within that 30-day period either may be collected as a single
test sequence across the required load points or may be obtained on
two or more separate occasions when the engine load corresponds to
that required under section 3.1 of
these Guidelines.