Know position, use ip and html5geo, with jquery

function getCurrentPositionUsGeoAndIp(){

    var D = $.Deferred();

    try{
        //using navigator geolocation
        if( navigator.geolocation ){

            navigator.geolocation.getCurrentPosition( foundCordsUseGeoSuccess, foundCordsUseGeoFail );

            function foundCordsUseGeoSuccess( position ){
                var coords = {
                    lat: position.coords.latitude,
                    lon: position.coords.longitude
                };
                D.resolve( coords );
            };

            function foundCordsUseGeoFail(){
                D.reject(002);
            };
         
        } else { 
            //using IP
            var urlForIp = 'http://ip-api.com/json';
            $.getJSON( urlForIp ).done(function( data ){
                var coords = {
                    lat: data.lat,
                    lon: data.lon
                };
                D.resolve( coords );
            }).fail(function(e){
                 D.reject(003);
            });
        }

    } catch(e){
        D.reject(001);
    }

    return D;
}

getCurrentPositionUsGeoAndIp().done(function( pos ){
    console.log(pos);
}).fail(function( e ){
    alert( e );
});