Browsers use navigator.geolocation, but it's often imprecise because they don't access GPS directly. Instead, they rely on:

Wi-Fi networks (accuracy depends on external databases). Cell towers (less precise, can be off by hundreds of meters). IP address (very inaccurate, can be off by kilometers)

Because browsers don’t have direct GPS access, no JavaScript library can guarantee pinpoint accuracy. I faced this challenge in one project, and I just drew squares in my database. This doesn’t solve the problem but can be useful in some situations. You could also develop a phone app, as the phone app provides better accuracy if the user grants the permissions."