Something I noticed when driving around.
My phone’s GPS usually does a great job at telling what lane I’m on and how far I am to an intersection, but it does a terrible job at telling if I’m on or under an elevated expressway.
Why can it tell my horizontal position so much better than my vertical position?
The phenomenon is independent to the model and make of the phone as well. I’ve switched from Android to Apple, and both phones seem to be terrible at telling if I’m on an elevated expressway or on the road under it.
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* GPS is the system of satellites that send their name and the time to you from space.
* Your phone has a *navigation system* and that’s what has a hard time telling if you’re on an elevated expressway.
* That navigation system uses GPS signals in addition to other things to help figure out where you are.
* As other’s have said, sometimes the GPS signal gets weak and the system tries to rely on other options for your location.
* For this reason there is a little “wiggle room” in the location when the GPS signal is weak and that can lead the navigation system to get a little confused.
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