Why Is My Phone's GPS Inaccurate?

Short answer: under open sky, a modern smartphone's GPS is typically accurate to about a 4.9-meter (16-foot) radius, according to the U.S. government's official gps.gov accuracy page. It gets considerably less accurate indoors, in dense cities, near tall buildings, or under heavy cloud or tree cover — not because anything is broken, but because the signal has a harder path to your phone.

What Actually Affects GPS Accuracy

• Sky visibility — GPS needs a relatively clear line of sight to satellites; walls, roofs, tall buildings and dense tree canopy block or reflect the signal.
• Urban canyons — tall buildings close together can reflect signals and confuse positioning, a well-known effect in dense city centers.
• Weather — heavy cloud cover and storms can degrade signal quality somewhat, though it's a smaller factor than physical obstruction.
• Time to first fix — right after opening a location app, the first reading is often less accurate until the device locks onto more satellites.
• Device and sensor fusion — phones blend GPS with Wi-Fi and cell-tower positioning to estimate location, which helps indoors but is inherently less precise than a clear-sky GPS fix.

What Doesn't Help

Closing background apps, restarting the phone, or toggling airplane mode on and off don't address the underlying cause if you're indoors or in a poor-visibility spot — accuracy is governed by what the GPS receiver can actually see, not by device load.

Getting a Better Reading

The most reliable fix is simple: move to a spot with a clearer view of the sky — outdoors, away from tall buildings, and away from dense tree cover — and give the device a few seconds to get a fresh fix.

Our My Location Tracker app shows your current coordinates along with a live accuracy radius, so you can see directly how much the reading improves once you're under open sky. You can also check your current reading with the free online GPS accuracy tool.

Sources

• GPS.gov, "GPS Accuracy" — https://www.gps.gov/gps-accuracy