pilotage vs steerage

pilotage

noun
  • The use of landmarks to guide a vessel or aircraft to its destination. 

  • The occupation of a pilot. 

  • The fee paid to a pilot. 

steerage

noun
  • The effect of the helm on a ship. 

  • The section of a passenger ship that provided inexpensive accommodation with no individual cabins. 

  • The art of steering. 

How often have the words pilotage and steerage occurred in a corpus of books? (source: Google Ngram Viewer )