Latitude and Longitude Explained for Everyday GPS Users
Learn how latitude and longitude identify a position and why coordinate precision does not guarantee real-world accuracy.
Latitude and longitude describe a location on Earth's surface using angular coordinates. Latitude measures position north or south of the equator; longitude measures east or west of the prime meridian. A phone tracker may expose these coordinates to its page, but the number of decimal places should not be confused with measurement accuracy.
Reading the coordinate pair
Latitude ranges from 90 degrees south to 90 degrees north. Longitude ranges from 180 degrees west to 180 degrees east. A coordinate pair must keep the order clear; reversing latitude and longitude can place a point somewhere entirely different. Decimal degrees are common in browser APIs, while maps may show degrees, minutes and seconds.
Decimal places are not accuracy
A coordinate displayed to six decimal places looks precise, but the underlying position can still be wrong by several metres or more. Formatting a noisy estimate with extra digits does not add information. A trustworthy interface should explain uncertainty when available and avoid claiming survey-level precision based on decimal formatting alone.
Coordinate changes and distance
Two coordinate pairs can be used to estimate the distance between points, accounting for Earth's curvature with a spherical approximation such as the Haversine formula. But if either point is noisy, the calculated distance inherits that uncertainty. A sequence of points can also miss turns between samples.
Privacy considerations
Coordinates can reveal sensitive routines and locations. Avoid sharing raw coordinates in public bug reports, screenshots or analytics unless there is a clear reason and appropriate consent. A site's privacy policy should say how coordinates are processed, whether they leave the browser and how users can stop location access.
Frequently asked questions
Do more decimal places mean a more accurate location?
No. They only change the formatting of the coordinate.
Can latitude and longitude reveal a home address?
They can identify a location closely enough to be sensitive, so treat them as private information.
Technical references
These references explain the underlying browser and positioning concepts. They do not imply endorsement of this website.