gangboard vs landing

gangboard

noun
  • A board or plank placed within or without the bulwarks of a vessel's waist for lookouts to walk or stand on. 

  • The boards ending the hammock-nettings at either side of the entrance from the accommodation-ladder to the deck. 

  • A board or plank used as a temporary footbridge between a ship and a dockside or any gap such as scaffolding. 

landing

noun
  • A place on a shoreline where a boat lands. 

  • An arrival at a surface, as of an airplane or any descending object. 

  • A level area at the top of a flight of stairs, or connecting one flight with another. 

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