VHF omnidirectional range

Have you ever seen a signpost on the road that tells you which way to go? Airplanes have something like that, but they use invisible radio signals called VHF omnidirectional range, or VOR for short! These signals come from special towers on the ground.

When an airplane has a VOR radio inside, it can 'hear' these signals and figure out which direction it's going, like a super-smart compass. It helps pilots stay on their flight path, just like you follow a map to get to a friend's house.

So, how does this magic work? The VOR towers send out two kinds of radio signals. One is like a steady beat, and the other spins around like a clock's second hand.

The airplane's VOR radio listens to both. By comparing the steady beat to the spinning signal, the radio can tell the pilot exactly which 'line' or 'radial' they are on, pointing away from the tower. It's like the tower is saying, 'You are on the line pointing straight north from me!' or 'You are on the line pointing east!'

These amazing sky signs weren't always around! They were invented a long, long time ago, back in 1945, in the United States. It was a big project to help airplanes fly more safely.

The first VOR towers started helping planes in 1949. Imagine, even before many people had cars, pilots were using these special radio signals to navigate the skies! They were a really big deal for making flying safer and more reliable.

VOR is super important because it helps pilots know their exact position. Even if it's cloudy and they can't see the ground, they can still use VOR to know where they are. It's like having a secret map that works even when you can't see outside!

While newer technology exists now, VOR was a giant leap for flying. It helped make sure airplanes could travel long distances safely, connecting cities and countries all over the world.