I asked my son that, as he has a new pickup with a GPS. He answered quickly and confidently, and I couldn't understand it all....lol
Basically, it depends upon what kind of GPS it has. Some are automatic by default and would be harder to by pass. Others can just be turned off or unplugged, or batteries removed, depending on what kind of model, apparently.
https://www.brighthub.com/electronics/gps/articles/66342.aspx
First of all, you need to locate the device. They’re not all in the same place. If you buy a new car, you can always ask the dealer to remove the device before you leave the car lot.
If your car is not new, you’re going to have to locate it yourself and turn it off. Sometimes the devices are built directly into the vehicle itself. This means that if you do locate it, you simply need to remove the fuse from the GPS device.
Don’t forget, even if you do disable the GPS tracking system in your car or truck, you may still be able to be tracked by your cell phone or other device. To completely disable the GPS system in your car, you should consider buying the GPS Tracker Defense.