What year were land sailing invented?

Why did Germans feel unrestricted submarine warfare would help end World War 1? What equipment must be installed in a powerboat to prevent excessive noise? What force slows a boat down? How many sailboats are sold in the us every year? What is the name for the underside of the boat? What does the jib do on a sailboat? When was the first fiberglass boat made? What shoes do I bring on a cruise? How old is a Johnson 4HP outboard motor serial number b3637 4br74r? What the Inuit made canoes out of? How much does the average sailboat cost? Why is a boat called a sandsucker? Who where experts in trade and sailing and who created travel logs? What best defines the total weight of a persons gear equipment fuel and motor assembly found on a vessel? When loading a boat passengers should enter the boat at? Where can I get a top for my 19' smoker craft pro Alaskan boat? How do you transfer ownership of a mobile home in Massachusetts? The best cruising sailboat? Did women make the canoes in Iroquois? In addition to pfd what other equipment must be on board of a vessel 16 feet or longer?