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How programable are the EFIS?

Are you asking about an EFIS or EMS?

Most EMS's are adjustable and the color moves with the numbers you put in.
 
EFIS settings

I have a GRT Sport, and all the EFIS's I've seen have the 'arc' airspeeds defined by user settings. The VNE (red line) speed does NOT change with Altitude - the markings are just like a steam gauge ASI.
I haven't even seen an alert or warning setting for TAS - which would serve the purpose of an altitude corrected VNE. That would be an interesting feature to add...
 
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