How Do I Get Exact Value Of My Latitude And Longitude On Using Geolocation ?

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ASP.NET

Javascript

Google-Maps

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I am using geolocation api to get latitude and longitude of place i am in.. here is my code..

<script type='text/javascript'>
          var x = document.getElementById('add');
          var c = function (pos) {
              var latitude = pos.coords.latitude;
              var longitude = pos.coords.longitude;
              coords = latitude + ',' + longitude;
              document.getElementById('google_map').setAttribute('src', 'https://maps.google.com.np/?q=' + coords + '&z=20&output=embed');
              x.innerHTML = "lat:" + latitude + "<br /> long: " + longitude;
      }
<pre lang="cs">document.getElementById('get_location').onclick = function () {
              if (navigator.geolocation) {
                  navigator.geolocation.getCurrentPosition(c);
                  return false;
              } else {
                  alert("Geo Location is not supported on your current browser!");
              }
          }
      </script>

here pos.coords.latitude & pos.coords.longitude returns my latitude and longitude but the problem is sometimes it returns full value ie. my degree, minutes and seconds showing me in the exact place where i am and sometimes it returns only my degree and round off value in minutes resulting to show me is different place where i am not.. how can i get full value and avoid round off value via coding??

anyway thanks in advance..