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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In addition to the map/nav app itself being confused, as other comments have mentioned, sometimes physical structures can interfere with the GPS signals as well. If you’re under a concrete expressway, the GPS signals might be weak and the accuracy goes down— the signals are coming from satellites in space after all.
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