How Geolocation Works: GPS, Wi-Fi, Cell & IP Explained

The four positioning methods behind every location feature -- and how accurate each one is.

What Is Geolocation?

Geolocation is the process of determining the real-world geographic position of a device, usually as latitude and longitude. Phones, laptops and websites use it to show maps, find nearby places, tag photos and deliver location-based services. A device can work out its position in four main ways -- GPS, Wi-Fi, cell towers and IP address -- and usually combines them.

The Four Geolocation Methods

Method	How it works	Typical accuracy	Strengths / limits
GPS / GNSS	Receiver times signals from at least four satellites (GPS, Galileo, GLONASS, BeiDou) to calculate its position	About 5 m on a phone outdoors	Accurate outdoors; weak indoors and between tall buildings; uses more battery
Wi-Fi positioning	Device scans nearby Wi-Fi networks and compares them with a database of known router locations	Roughly 10-50 m	Works indoors in cities; poor in rural areas
Cell towers	Position estimated from which towers are visible and their signal strength	Hundreds of meters to km	Works almost everywhere with coverage; low precision
IP geolocation	IP address matched to a registry/database of network locations	City or region level	No permission needed; often wrong by many km, fooled by VPNs

How Browsers Get Your Location

Websites use the W3C Geolocation API. The browser asks for your permission, then the operating system supplies the best available position (GPS, Wi-Fi or cell) along with an accuracy radius. Sites must be served over HTTPS to use it. You can try it with My Location.

Latitude, Longitude and the WGS84 Datum

Whatever the method, the result is expressed as latitude and longitude on the WGS84 reference system -- the same system used by GPS and online maps. Get any coordinate with the latitude and longitude finder.

Privacy and Geolocation

Browsers and phones require your permission before sharing precise location.
You can allow location "only while using" an app, or share approximate location only (iOS and Android both support this).
IP-based location can be estimated without permission, but only to city/region level.

Common Uses of Geolocation

Navigation and ride-hailing
Weather and local search
Photo geotagging
Fraud prevention and content licensing (IP-based)
Emergency services location