title: How accurate is the W3C Geolocation API?
body: <p>I have been reading the <a href="http://dev.w3.org/geo/api/spec-source.html" rel="nofollow noreferrer">W3C Geolocation API specification</a> and I was wondering if anyone has found any information on how accurate the location returned is.</p>
  
  <p>I found the <code>accuracy</code> attribute:</p>
  
  <blockquote>
    <p>The accuracy attribute denotes the accuracy level of the latitude and
    longitude coordinates. It is specified in meters and must be supported
    by all implementations. The value of the accuracy attribute must be a
    non-negative real number.</p>
  </blockquote>
  
  <p>But I'm wondering if anyone is aware of a possible range for these values?  Is there a maximum number of meters that will be returned?  </p>
  
  <p>Any application I wrote that used this would be used in a relatively small geographic area, does the accuracy depend on where that area is?</p>
  
  <p><strong>Note:</strong></p>
  
  <p>I found a <a href="https://stackoverflow.com/questions/3242462/exactly-how-accurate-is-ip-geolocation">similar question</a>, but it does not talk about the accuracy range and I believe they are talking about using Google's GeoLocation service.</p>