how do package trackers for UPS & Amazon work?

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how do package trackers for UPS & Amazon work?

In: Technology

Each package is assigned a number, which is why you get a tracking number you can use to see where it was last seen.

That number is entered into a computer database. When the package is loaded onto or off of a truck/plane that number is scanned and tagged with the time and location where it was scanned.

The computer makes a best guess on when the package will arrive based on all of the scheduled travel between the package’s origin and destination.