Hi 3rd ACR Tanker,
the raid is definitely spotted by Penzance. When you set up the raid in player vs player, the RAF gets the message I showed in my original pic. Penzance spots you each time, every time.
I must admit, I think the suggestion that random shipping may spot this raid carries some merit. But we need to consider three points.
Firstly, was the Bristol Channel any busier than other places for shipping traffic ? There's similarly heavy coastal traffic on the British east coast as well. As well as the merchants plying their way up and down the coast, there's the RN destroyers in and out of Harwich, Sherness, Humber etc, as well as the other small boat anti-invasion patrols, and numerous minesweepers, and fishing boats.
Secondly, consider where the bulk of the Bristol Channel shipping should be. ie on the northern side, serving the numerous industrial ports in south Wales. There's nothing on the southern side, save "holiday village" harbours. The targets on the south Wales side will spot the raids over where the shipping was.
Thirdly, should we open the whole can of worms of having boat observations in BTR off the coast of Holland and Denmark ? In the Med ?
Are these ships linked to Fighter Command, like the Observer Corps were ? No.
Could this occassional chance of boats pass on a continual line of plots, accurate estimations of aircraft directions, numbers and altitude, like the carefully laid out array of Observer Corps posts ? No.
Still looking at map of UK and thinking the only reason I can't fly to the left of Cornwall is because someone snipped the map there.