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Originally Posted by bjornhall
Or could it just be that it is cheaper to make, but can be priced higher...?
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Precisely! However, it can extended in ways that are not possible with conventional instruments, from simple things like trend tapes and wind vectors to synthetic vision.
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Originally Posted by BackPacker
How many pilots use these [backup] instruments as their primary instruments when wanting to know quickly what the speed/altitude and speed/altitude changes are?
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The only time I've done that was the first time I flew in a G1000 equipped aircraft. It was too confusing, so I decided to concentrate on adapting to the new technology and only look at the backups as part of my FREDA checks.