You may already be aware that you can have map view or satellite view in Google Maps, and typing 'Campsites near xxx' hit search will bring up several options, and a list on the LHS of the screen with website links where they exist. In most areas you can zoom in (or drag and drop the yellow figure - screen lower right) to get street view to check gateways etc.
I have just used it to check 'Campsites near Wicken' as we stopped off at Wicken Fen NT en route, but would like to take the van back and explore more. Also 'Campsites near Roscoff' in reply to another questioner showed the position of the sites PC Forumers had recommended - and that my recommendation had changed names since we used it!
I have just used it to check 'Campsites near Wicken' as we stopped off at Wicken Fen NT en route, but would like to take the van back and explore more. Also 'Campsites near Roscoff' in reply to another questioner showed the position of the sites PC Forumers had recommended - and that my recommendation had changed names since we used it!