Since the last time I looked, G.E. has added an enhanced-definition
area to the West of London, which includes the Weybridge, Staines and
Eton/Windsor reaches. A certain purveyor of aquatic conveyances to the
nobility and gentry can be found at 51N 25'45, 0W 30'41.
The boundary between this area and the neighbouring one at Maidenhead
goes through the middle of the Dorney course, rather unfortunately
because the two halves don't line up, also the more recent image has
the return lane whereas the older one doesn't.
Strictly for geeks and Belgians, they have also enhanced the area
around Brussels so my club is visible at 50N 53'58 4E 24'08.
Royal Sport Nautique de Bruxelles