Mapa do Google, clique no marcador de destino do link externo. Encontre a demonstração do violino abaixo.

encontrar demo de violino

google.maps.event.addListener(marker, 'click', (function(marker, i) {

        return function() {
          infowindow.setContent(locations[i][0]);
          infowindow.open(map, marker);
          map.setZoom(9);
          map.setCenter(marker.getPosition());  
        }
      })(marker, i));

function triggerClick(i) {
    google.maps.event.trigger(markers[i],'click');
}

<ul class="nav">
<li><a href="javascript:triggerClick(0)">location1</a></li>
<li><a href="javascript:triggerClick(1)">location2</a></li>
<li><a href="javascript:triggerClick(2)">location3</a></li>
<li><a href="javascript:triggerClick(3)">location4</a></li>
</ul>