Crap uncurrent pilot, occaisional yachtsman, driver of a gas guzzler, Northern Exile, Idler, International drunkard and traveller and furiously henpecked by The Dere Northerner
http://www.eurocontrol.int/msa/public/standard_page/modes_tech_overview.html.Mode S transponders have no need for a feed from GPS. This is a mechanism to allow TCAS / ACAS to work withother types of aricraft.I know you rag and bone men like the freedom of the skies and all that - and as long as you stay away from everything remotely like controlled airspace that is fine.And with a cruise of around 45kts it is all well and good. But for all intents and purposes that 747 on a divert to Birmingham from Stanstead cant see you, and wont. The first they will know is as No 4 engine goes pop as a glider gets sucked in. Coupled with that affliction gliders have with hanging around cloud base - it aids to survival.The skies are crowded - and speaking as someone who didnt have an airprox with a harrier but saw one everso close as it went past at 600kts - anything that helps them see me is a bonus. (i was squaking on Mode C 7004 - conspic for aerobat ops).I see the big brother concerns but in this instance it rests on fact old chumhave a squizzhttp://en.wikipedia.org/wiki/Transponder_(aviation)
I don't have a tinfoil flying helmet, if that is what you are implying.....
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