Example of marker with custom icon (image)

/*global google, $*/
(function () {
    "use strict";

    var mapOptions,
        mapCanvas,
        map;

    mapOptions = {
        zoom: 13,
        center: { lat: 50.7787589, lng: 7.1877042 },
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };

    mapCanvas = document.getElementById('map-canvas');

    map = new google.maps.Map(mapCanvas, mapOptions);

    var gpsLatLng = new google.maps.LatLng(50.7787589, 7.1877042);

    var marker = new google.maps.Marker({
        position: gpsLatLng,
        map: map,
        icon: 'excaliburResized.jpg'
    });
}());