Geograph - photograph every grid square

Images of buoys, beacon, rocks and skerries seen on the CalMac ferry from Harris across the Sound of Harris to Berneray and the southern Outer Hebrides. A small gap of 11.6km as the guillemot might fly, but the ferry has to take a much more devious route to navigate through the shallow passage - about 16.5km along the route shown on Google Earth, which seems very close to the route on the day. No regular ferry time-tabling for the ferries is possible, because of the changing tide times through the lunar cycle - passages at low tides are not wise! The precise location of the named buoys was obtained from listings in the Aids to Navigation Review 2015-2020, [obtainable at nlb.org.uk [Policies/Documents/GLA-AtoN-Review-2015], but I have been unable to find a direct link to the pdf. Published 2015 © Commissioners of Northern Lighthouses, Trinity House, Commissioners of Irish Lights]. They were plotted on the Google Earth map and the locations of the other images calculated by the time intervals between the known points of the buoys, and GPS observations made en route.