Spanish Waltzer, firstly if you go back to the beginning of this thread you will notice I posed a question, which was genuine, and designed to elicit more information from folk who responded to help me answer the question for myself. You seem to labour under the misconception that I already approached the question with a hard and fast view of my own, - well I did'nt. I merely posed a question to try answer something for myself that I have wondered about. To suggest I ought to have begun with all sorts of supporting evidence for a view I did not have makes little or no sense.
In this respect, IE: the scanario of air sea rescue, I did not pose as an expert in any way shape or form, so if you wish to discredit me in some way its a tad disengenious to try it on basis that I set myself up as any osrt of expert, -that is your mistake and yours alone.
Regarding typos, yeah, I am not a secretary or for that matter a typist, but had there been no typos it appears I'd still have had difficulty communication clearly with you. I'd suggest you correct your own more significant and fundamental errors about the nature of my post before you whine about less relevant typos?