"Wireless Communication"
The cache - my most southerly, thereby beating the Portland Bill cache from 2007, was found in a different place and on a different day to this photo. The cache was a relatively easy micro near Poldhu Cove.
This photo (mine - honest!) is of Asparagus Island, off Kynance. Apparently there is a s*it-hot cache on the island which I hope to come back for, in another life.