Once upon a time… My C172 with G1000 incremented in 100ft and 1000ft increments (inner and outer vernier, respectively), like all others planes I still fly do today. Some time ago, this suddenly changed and I don’t know what I did (I’m sure it’s me). The inner vernier increases in 164’ increments (0ft - 164ft - etc) and the outer vernier increments in 1,640ft increments. It’s impossible to select 500’ or 5,000’ ! Any ideas? Thanks Mark
Looks like the altitude tape is in meters but the altitude selection is in feet?
Note that 50m == 164 ft
@Vibstronium Spot ON! Thank you so much! I must have hit that under PFD on the G1000 and never knew it. Sanity restored… 
Appreciatively, Mark
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Huh…
I had a strangely similar issue. I bound ALT select onto a rotary (?) on my Virpil Control Panel. Used to be fine and in 100 meter increments. A while back that changed and now it goes up/down in steps of 2200 or so. This has been going on for sevral months and releases so its not a switch I touched by accident (I think).
Really weird.