M9U2Reading.ppt

人教课标
高三选修 9
Unit 2
Unit 2 Sailing the oceans
Reading
Navigator
sea
nautical instruments
find new islands or continents
A navigator explores the sea.
Explorer
land
pass and landmarks
find new places within an already identified island or continent
An explorer discovers new places on land.
Pre-reading
The four basic instruments for navigation: compass, astrolabe, sextant and nautical chart.
Sailing the oceans
Read about what navigation was like before modern instruments were used.
Scanning
How did seamen explore the oceans before latitude and longitude made it possible to plot a ship’s position?
Page 1
Using nature
Keeping alongside the coastline
Using celestial bodies
Using wildlife
Using the weather
Using the sea
Using celestial bodies
to plot the positions
to work out the latitude
a special cloud formation indicates
there is land close by
( 2 minutes )