3 Can you identify these early navigational instruments seamen used and explain how they are used? 1 compass(in ancient China) 2 astrolabe 3 sextant 4 sea /nautical / marine chart 4 Which ones do you think are still used today? Sea charts are still used today
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) astrolabe sextant sea / nautical / marine chart
Comprehending 1 Read the passage and answer the following questions 1 What is the use of a bearing circle, astrolabe, quadrant or sextant?(B) What is the use of a compaSs?(A) a to set the course of the ship b to measure the position of the ship c to measure the speed of the ship d to tell the time
Read the passage and answer the following questions. 1 What is the use of a bearing circle, astrolabe, quadrant or sextant? ( ) What is the use of a compass? ( ) A to set the course of the ship B to measure the position of the ship C to measure the speed of the ship D to tell the time Comprehending 1 B A
2 Why are speed and time important in working out the longitude of a ship? Speed and time are important in finding out the longitude of a ship because the earth moves fifteen degrees westwards every hour If you know your direction, speed and time you can work out the approximate longitude or change in your position in relation to the stars
2 Why are speed and time important in working out the longitude of a ship? Speed and time are important in finding out the longitude of a ship because the earth moves fifteen degrees westwards every hour. If you know your direction, speed and time, you can work out the approximate longitude or change in your position in relation to the stars
3 Why is the position of the sun and various stars useful for working out latitude? The position of the sun and stars are useful for working out latitude because they are fixed points in the sky and their movements in relation to the earth are already known So they can be used to measure a ship's position
3 Why is the position of the sun and various stars useful for working out latitude? The position of the sun and stars are useful for working out latitude because they are fixed points in the sky and their movements in relation to the earth are already known. So they can be used to measure a ship's position
2 Suppose you were a sea captain aiming to sail round africa. Discuss in groups 1 What skills would you seek in your sailors? The sailors would need to be excellent navigators, able to cope with both hot and cold weather, experienced in sailing through very bad weather and able to co-operate in a team
Suppose you were a sea captain aiming to sail round Africa. Discuss in groups: 1 What skills would you seek in your sailors? The sailors would need to be excellent navigators, able to cope with both hot and cold weather, experienced in sailing through very bad weather and able to co-operate in a team. 2