geoLocation.GetCurrentPosition always fails in IE 11

The script below works fine in FireFox and Chrome, but in Internet Explorer 11, it always fails (with POSITION_UNAVAILABLE). I have set the browser to allow requests for position, and I agree to the prompt the browser presents me when requesting permission. I'm almost certain that this worked fine a few months ago when I was last experimenting with it. What could I be missing as far as IE's settings? ``` <script type="text/javascript"> $(document).ready(function () { if (Modernizr.geolocation) { navigator.geolocation.getCurrentPosition(positionSuccess, positionError, { enableHighAccuracy: true, maximumAge: 60000, timeout: 10000 }) } else { $("#GeoError").html("Unable to retrieve current position.") } }); function positionSuccess(position) { $("#Latitude").val(position.coords.latitude); $("#Longitude").val(position.coords.longitude); } function positionError(error) { var message = ""; // Check for known errors switch (error.code) { case error.PERMISSION_DENIED: message = "This website does not have your permission to use the Geolocation API"; break; case error.POSITION_UNAVAILABLE: message = "Your current position could not be determined."; break; case error.PERMISSION_DENIED_TIMEOUT: message = "Your current position could not be determined within the specified timeout period."; break; } // If it's an unknown error, build a message that includes // information that helps identify the situation, so that // the error handler can be updated. if (message == "") { var strErrorCode = error.code.toString(); message = "Your position could not be determined due to " + "an unknown error (Code: " + strErrorCode + ")."; } $("#GeoError").html(message) } </script> ``` Also, I get the same failure in IE11 when I try http://html5demos.com/geo, where both FireFox and Chrome work fine.