Dont patronise me IB,I know exactly how the RN navigational systems work !!!But you do seem a little unsure about what your saying !!!! In a previous post you claimed the earths atmosphere protected us from this solar activity but now you have changed your mind and say we get the "residue"..so which is it ?? All anyone is saying on this matter is that it is something that should be factored into the decision making regarding liberations.Something that would take little or no time to check. Your like a lot of others ..plenty to say when knocking someone who has a theory but say very little when asked for one of your own. Now this is the last I will post on this,unless that is, you come up with a credible alternative as to why this disaster happened ??