Question

[Buddy]

 1.Check the meaning of the words in the box. Then read and complete the text with the words

from the box. Listen and check.

(Kiếm tra nghĩa của các từ trong khung. Sau đó đọc và hoàn thành đoạn văn với các từ trong khung. Nghe

và kiểm tra lại.)

applications  receiver speed track

The USA invented the Global Positioning System (GPS)in the 1970s. At first, it was a military project,

but now anyone can use the system to find out exactly their locations, and (1) ……………. their movements. 

For GPS to work, your (2) …………….  (or smartphone)must be in contact with four or more satellites inspace. 

Then it uses the data to calculate the exact time and position on Earth. 

However, it is not enough for survival situations (escaping the jungles or deserts) because you must know

your direction (which way you are moving) and your (3) …………….  (how fastyou are moving). GPS provides

this information, by tracking yourposition over time. 

For modern explorers, a smartphone and GPS are as important as a compass, torch and map. With the right

(4) …………….  , your smartphone will help you survive.