navigate vs snorkel

navigate

verb
  • To travel over water in a ship; to sail. 

  • To plan, control and record the position and course of a vehicle, ship, aircraft, etc., on a journey; to follow a planned course. 

  • To move between web pages, menus, etc. by means of hyperlinks, mouse clicks, or any other mechanism. 

  • To give directions, as from a map, to someone driving a vehicle. 

  • To find a way through a difficult situation or process. 

snorkel

verb
  • To use a snorkel. 

noun
  • A snorkel parka. 

  • A retractable tube fitted in diesel-engine submarines to allow sufficient ventilation that the engines may be used at periscope depth. 

  • A hollow tube, held in the mouth, or mounted on and opening into a diving mask, used by swimmers for breathing underwater. 

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