title: Google Map API Marker Icon Url?
body: <p>I'm trying to change marker icon to "red-circle" or "red-pin" or anything else.
  In these codes;</p>
  
  <pre><code>markerOptions: {
        icon: 'images/beachflag.png'
      },
  </code></pre>
  
  <p>the marker doesn't show. But if i make the <code>icon</code> line a comment line, so marker shows like <em>"<code>red-pin</code>"</em>  icon</p>
  
  <p>So, i need to marker icons list or URL list which directly supported by Google Map API. Or is there such a thing?</p>
  
  <p>Thank you.</p>