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How much is an INS?

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Hi folks, Does anybody know how much an inertial navigation system costs in average? The ones used by airliners. I was just curious because I've heard several people saying that this is THE MOST expensive avionic inside those airplanes. Is that true?Thanks,Leo

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INS were mechanical, I don't think they make them anymore, the current systems are ring-laser based and are typically called IRS (Inertial Reference System). If I recall the price for a single unit is somehwere around $300,000. Michael J.WinXP-Home SP2,AMD64 3500+,Abit AV8,Radeon X800Pro,36GB Raptor,1GB PC3200,Audigy 2

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