Imagine you and your friend are playing a game of tag. Your friend needs to tag you but they can't see you because you're hiding behind a tree. Your friend thinks you're on the left side of the tree so they run and tag the left side, despite you actually being on the right side. Your friend made a mistake in their position, which caused them to miss you. This mistake is what we call a position error.
In real life, position error happens when something or someone is trying to find or locate something else, but they get it wrong. This could happen with GPS devices, robots, or even humans trying to locate a specific place. So just like in our game of tag, if someone relies on the wrong information to find something, they might not be able to find the correct position.
Position error can be very important when it comes to things like navigation, where you need to be very precise. If a GPS device makes a position error, you could end up lost or going to the wrong place. It's like if your mom went to the wrong house while trying to pick you up from a friend's house. That would cause a lot of confusion and could be dangerous. That's why it's important to always try and reduce position errors as much as possible.