Selecting a year will include all cruises in that year and will tend to increase the number of cruise records returned in your search. Selecting none will search all years.
 

and

Return vessel cruises which include research under the following projects:

Selecting one or more projects will include all cruises in that project and will tend to decrease the number of cruise records returned in your search.

and

Selecting a location will limit the search to only those cruises that visit that area and will tend to reduce the number of records returned in your search. Selecting more than one location will return only cruises that visit ALL selected locations. Selecting no locations will search for all cruises in the selected year(s).

and

Selecting vessels will limit the search to only those cruises that have your selected vessels as part of the cruise.