How Accurate Is Browser Geolocation? A Practical Field Guide

‘Allow this site to use your location’ hides a stack of sensors and network lookups. The number that comes back can be excellent or nearly useless depending on the device, the sky, and whether the operating system is allowed to use precise mode. Treating every blue dot as survey truth is how people file the wrong county on a form.

Rough accuracy bands you will actually see

• Outdoor GPS, clear sky: often ~5–15 m, sometimes better on recent phones
• Urban canyons and dense trees: tens of metres, occasional jumps
• Indoor Wi‑Fi assisted: highly variable; whole-building error is common
• IP-only fallback: city or region scale — not a street pin you should defend

Permission, precision, and operating systems

Browsers can only use what the OS grants. Some mobile systems distinguish approximate and precise location. Desktop browsers without GPS lean on network signals. A denied prompt is not a bug in the map tool; it is the user (or policy) choosing privacy over a pin. Re-requesting permission after a deny often requires opening site settings manually.

How to sanity-check a result

Look at the map, not only the text fields. If the pin is in a river and you are in a café, nudge it or walk outside for a fresh fix. Compare city and country labels with what you already know. When stakes are high — legal filings, emergency instructions, property disputes — browser geolocation is a starting clue, not a finished survey. Licensed measurement and official records still win.

Using MapBench tools without over-trusting them

Find My Location is built for a fast, permission-based pin and readable coordinates. Pair it with county/city tools when administrative labels matter, and with coordinate converters when another system demands DMS or a grid reference. For public IP pages, remember you are inspecting the network identity, which may diverge from the person holding the phone.