GeoNetwork seems to use OpenStreetMap and MapQuest as default WMS (or WMTS), but I found nothing about that in the documentation.
Can I change it to another WMS or WMTS, if so how?
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If you enter the administration console, you will find a field where you can define the base layers (and projection and all the init configuration) of the map.
More information on the GeoNetwork documentation: http://geonetwork-opensource.org/manuals/trunk/eng/users/customizing-application/search-ui/configdefault.html