app/views/shared/header/_menu.html.erb
<nav>
<ul class="menu">
<li class="menu-item maps <%= 'active' if menu_active?('maps') %>">
<a href="<%= maps_path %>">
<%= icon "globe", t('header.menu.maps') %>
</a>
</li><li class="menu-item data <%= 'active' if menu_active?('geo_data') %>">
<a href="<%= geo_data_index_path %>">
<%= icon "map-marker", t('header.menu.data') %>
</a>
</li>
</ul>
</nav>