Coastlines? COASTLINES? Eeee, the PPL of today. When I were a lad we had to follow disused railway lines. And tiny rivers which blended into the yellow blob of a conurbation. And keep a sharp lookout for derelict powerstations.
You'll be after one of those new fangled GPS devices next.
Although I must confess, the Humber estuary is a reassuring sight when flying over Yorkshire and Lincolnshire.