7. It's easy to find the way over short distances (距离). You can ask a friend or read a map. But what about over long distances? How do people find their way?
The sun and the stars can be followed. By looking at their positions (位置), people know what direction they are going. This method (方法) works for clear skies, but when it's cloudy, the sky can't be seen. What can people do then?
At that time, a compass is used. A compass shows north, south, east, and west. It can be used in any weather. Unfortunately (不幸地), using a compass is not so easy. First, you need to know where north is on the map. Then, you can set the compass.
These days, a newer method is used — GPS. Now, maps for all over the Earth are on the computers. People can read these maps on computers in their cars, in their homes, and even on their phones. It is very useful for people who often travel. But what if the computer has a problem?Well, we can always go back to using the sun and the stars!