Edit in JSFiddle

      // create a map that replaces the default service with
      // one using a string for the src property instead of a function
      var map = $("#map").geomap({
        center: [-71.0595678, 42.3604823],
        zoom: 8,
        services: [ {
          id: "osm-string-src",
          type: "tiled",
          src: "http://tile.openstreetmap.org/{{=zoom}}/{{=tile.column}}/{{=tile.row}}.png"
        } ]
      });

    <div id="map">
    </div>
    <div class="info">
      <h1>string service src</h1>
      <p>This example shows how you can set a service's src property to a jsRender template string.</p>
      <p>The src property of the service object for this map is set to:</p>
      <p>&quot;http://tile.openstreetmap.org/{{=zoom}}/{{=tile.column}}/{{=tile.row}}.png&quot;</p>
    </div>

html
{
  font:13px/1.231 Calibri,Arial,sans-serif; *font-size:small;
}

.info 
{
  background: #fff;
  border-radius: 8px;
  box-shadow: -4px 4px #444;
  opacity: .8;
  padding: 8px;
  width: 95%;
}

fieldset { border: none; }

legend {
  font-size: 14px;
  font-weight: bold;
}

    #map
    {
      position: fixed;
      left: 0;
      top: 0;
      right: 0;
      bottom: 0;
    }