While route-flying south from the Canal Zone in the 1950s we always did a quick stop-over at Port Sudan. It was normal for crews to bring a stock of Commandaria (as I remember the spelling), brought in from Nicosia, for the ATC staff at that desolate spot. We had an old wartime nav on the squadron who wore his Observer brevet with pride. It was his idea of navigation to look out of the window over the desert or other featureless terrain, nod and mark our position on his chart. About 4 hours flying time to P.S and a little less than that on to Khormaksar. Never missed either place on a trip - they don't make navs like that any more,I think.