How it works
YourLo.ca/tion uses the HTML5 Geolocation Javascript API to find your location and display it. Google uses your phone's GPS and other information to do this.
The results are displayed as latitude and longitude, and UTM coordinates.
The accuracy is an estimate of how close to those coordinates you actually are. The accuracy value returned is intended to correspond to a 95% confidence level (the device's actual position is within the displayed number of meters of the position given 95% of the time).
Read more about the limitations of this technique and how to interpret the results.
Reloading
Experiments have shown that when an accuracy is quite low, hitting "reload" to re-calculate sometimes results in a more accurate location. This could be because the phone's GPS unit requires some time to get a fix, or the device's cellular signal strength changed.