conn vs head up

conn

verb
  • To direct a ship; to superintend the steering of (a vessel); to watch the course of (a vessel) and direct the helmsman how to steer (especially through a channel, etc, rather than steer a compass direction). 

noun
  • The duty of directing a ship, usually used with the verb to have or to take and accompanied by the article "the." 

head up

verb
  • To lead or take the lead in; to direct; to take charge of. 

  • To close (a cask, barrel, etc.) by fitting a head to it. 

  • To turn towards the wind 

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