Can GPS jammers really cut off any positioning system?

Since GPS is nothing more than weak radio waves, GPS jammers can be used to block or distort these waves, although technical equipment and expertise are needed to do so. GPS jammers were originally created by the government for military groups and spy agencies. Uses include confusing the enemy in precise locations or letting the enemy's GPS-guided missiles or bombs fall on them.
With the development of economy, there are more and more positioning systems such as GPS. GPS devices are really useful for our navigation and rescue. But on the other hand, it puts us in a position to create problems. A GPS jammer is a machine that cuts off a GPS signal and turns off all GPS devices within a specific range. Protecting our privacy really helps us.