GeoGraph - photograph every grid square

The Camddwr valley is one of the two main branches of Llyn Brianne reservoir Link and is separated from the Tywi valley by the Cnuwch peninsula. This view is from the northern slope of Dalarwen Link , on the edge of Dalarwen forest.
The stated photographer position was determined by GPS, which means that either my GPS got confused by the trees or the forest road is a little higher up the hill than where it is drawn on the map. My GPS track shows no anomalies, so I suspect it's the map that's wrong.