高中英语 Unit2Sailing the oceans-Textbook课件 新人教选修9 课件VIP免费

In pairs discuss these questions: 1 What is a navigator? A navigator explores new routes across the sea. 2 What is the difference between a navigator and an explorer? A navigator explores the sea; an explorer discovers new places on land.Warming Up 3 Look at these famous people. Are they navigators or explorers? What do you know about them? Navigator sea nautical instruments find new islands or continents Navigator is someone who finds the position and plots the course of a ship, an aircraft, a car, etc, using maps and instruments. Explorer land use of compass and landmarks find new places within an already identified island or continent Explorer is someone who travels into or through a place in order to learn about it. Very often navigators are also explorers. • Look at the pictures. Then answer the questions. 1 How do you think seamen found their way before modern accurate methods of navigation were invented? Kept close to the shore, used nature such as the sun, wind, birds, tide, etc, to help them, and used some of the instruments including a compass, astrolabe, etc.Pre-reading 2 Which do you think was easier to work out: latitude or longitude? Latitude, because it was used to measure how far you had travelled from land on a straight line. It was discovered a long time before longitude. 3 Can you identify these early navigational instruments seamen used and explain how they are used? 1 _________________________ 2 _________ 3 _________ 4 ________________________ 4 Which ones do you think are still used today? Sea charts are still used today.compass (in ancient China) astrolabesextantsea / nautical / marine chart Read the passage and answer the following questions. 1 What is the us...