I was reading about deaths and injuries caused by the WWII blackout in Britain. I wondered whether the=20 blackout actually caused the German bombers difficulties. I read that radio direction was used at that time. Perhaps navigational technology was not that good or not widely=20 available. What about silhouetting ships against the coast ? Was that a real danger ? Gus in Denver --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .