Each geographically sorted or time sorted file affected by a major change has been updated as well.
List of all files updated with major changes is under wmochanges.DATASET
(geographic) and yearchanges.DATASET (time),
along with the month/year of the last major update to this file.
It should be noted that all geographically and time sorted files are also updated with any minor changes which have been made.
Minor changes are all changes not covered in the definition of major changes, and include cruise number, country of origin, ship name, time.