Geolocation in Safari 5.1.7 doesn't work

<div id="content"></div>

<script type="text/javascript">
    $(document).ready(function () {

        function showPosition(position) {
            alert("showPosition");
            console.log("Latitude: " + position.coords.latitude + "<br>Longitude: " + position.coords.longitude);

            var latitude = position.coords.latitude;
            var longitude = position.coords.longitude;

            $.ajax({
                type: "POST",
                url: '/Home/Coordinates',
                data:
                {
                    latitude: latitude,
                    longitude: longitude
                },
                success: function (data) {
                    $("#content").html(data);
                },
                error: function () {
                    alert("Error");
                }
            });
        }

        if (navigator.geolocation) {
            alert("support geolocation");
            navigator.geolocation.getCurrentPosition(showPosition,function(error) {
                alert("error");
            },
            { maximumAge: 12000000, timeout: 30000 });
        }
        else {
            alert("not suported");
            console.log("Geolocation is not supported by this browser.");
        }

    });
</script>