Working navigator.gelocation for WebApp (navigator.standalone) in iOS 6.

webApp-geolocation-iOS6.js

if (window.navigator.geolocation) {

    var accuracyThreshold = 100,
	timeout = 10 * 1000,
	watchID = navigator.geolocation.watchPosition(function(position) {
		$('#latitude').val(position.coords.latitude); // set your latitude value here
		$('#longitude').val(position.coords.longitude); // set your longitude value here

		// if the returned distance accuracy is less than your pre-defined accuracy threshold,
		// then clear the timeout below and also clear the watchPosition to prevent it from running continuously
		position.coords.accuracy < accuracyThreshold && (clearTimeout(delayClear), navigator.geolocation.clearWatch(watchID))
	}, function(error) {

		// if it fails to get the return object (position), clear the timeout
		// and cancel the watchPosition() to prevent it from running continuously
		clearTimeout(delayClear);

		navigator.geolocation.clearWatch(watchID);

		// make the error message more human-readable friendly
		var errMsg;

		switch (error.code) {
			case '0':
				errMsg = 'Unknown Error';
				break;
			case '1':
				errMsg = 'Location permission denied by user.';
				break;
			case '2':
				errMsg = 'Position is not available';
				break;
			case '3':
				errMsg = 'Request timeout';
				break;
		}
	}, {
		enableHighAccuracy: true,
		timeout: timeout,
		maximumAge: 0
	}),
	delayClear = setTimeout(function() {
		navigator.geolocation.clearWatch(watchID);
	}, timeout + 1E3); // make this setTimeout delay one second longer than your watchPosition() timeout
}
else {
	throw new Error("Geolocation is not supported.");
}