Mayonnaise and sea charts

The saloon has been flooded with sea charts and the usual preparation chaos the past many days.  In between the never-ending stacks of charts, a few tin cans and a computer, the chief steward is hiding, trying to figure out how much mayonnaise, rye bread and mackerel an 8-people crew - consisting of young, danish sailors - will eat during a few months.
His facial expression shows very well the seriousness this task demands. If we run out of coffee or mayonnaise, being the chief steward is suddenly the most dangerous position on board. Therefore, we're taking due precautions - buying plenty of everything.