What is the use of mast in a ship?

Distance by boat from new york city to Nigeria? Did the first native Americans get here by boat? Why were the triangular sails important for sailing? How long does boat oil last in can? What does a Mobile or Manufactured Homes title look like in the state of RI? Why was teak wood used for submarine decks? What words have the same vowel sound as boat? Where can you get instructions on repairing a small crack in the bottom of your fiberglass boat? How did pirates get boats? How can the public be further educated about the use of PFDs and BUI? How tall is a fishing boat? How long does it take to take sail from Los Angeles to new york? Do you need a license to drive a boat in Canada? What helped to reduce the threat to allied shipping by German submarines in ww1? What happens if fire breaks out on back of boat? How can you calculate the maximum number of people on a boat? What model and year is a 15 hp Johnson outboard motor with serial? What factor determines a vessel's required equipment? What is the cost of a 9.9 hp outboard motor? Should I use Windstar cruise lines to plan my cruise ?