Is somebody following my track?

What does GPS stand for?

How many satellites does the GPS need to work?

• 24

• 20

• 25

When was the GPS invented?

• On June 26, 1993

• On July 15, 2006

Which country invented GPS?

• United States

• Mexico

• Japan

Mark 3 options of people who use the GPS.

• Scientist

• Doctors

• Teachers

• Military

• Fisherman

​ (a)   in Minnesota use GPS to study the movements and eating habits of deer. ​ (b)   in New York use GPS to measure land and buildings. ​ (c)   in Alaska use GPS to guide their boats. ​ (d)   in California use GPS to find out which mountains are getting taller and which are getting shorter every year.

• Scientists
• Surveyors
• Fishermen
• Geographers

It's the object that measures how much the ground shakes.

• GPS

• thermometer

• seismometer

Mark the 2 other functions of the GPS.

• It monitors ground motion caused by earthquakes.

• Combined with other tools, it can predict rainfalls and flashfloods.

• It prevents building falling.

• It prevents that the tsunamies cause floods.

Mark the natural disasters in which GPS can help people prevent themselves.

• rainfall

• flash floods

• earthquakes

• landslides

• wildfires

Reorder how the GPS works,

• A GPS receives information from control and monitoring stations all over the world.

• The GPS receiver uses those satellite signals and maps to show you where you are and the best way to get to where you are going.

• Those stations receive signals and images from human-made satellites that are orbiting Earth.