I'm a bit out of date now but there were 2 routes.
North west France, across the bay of Biscay, down through Spain and Portugal, over Gran Canaria and then down the coast of NW Africa over Dakar and back to the ocean for Asi.
Otherwise over Lands end and off out to sea passing well to the west of the Canary islands and down to Ascension.
It is a few years since I last flew the route though! Hope that helps.