In the health app (on a iPhone 6), just under the pedometer, it shows how many miles you've walked. I think the phone is able to work that out without GPS.
The M9 uses the same tech that's in the S1 on the watch. Which is something not available on the M8. It gives it better pace tracking for without GPS. Was mentioned in the link I posted earlier.
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But I personally don't think it's too much of a deal with the iPads. You can always flip the Smart Cover and it lights up, then just press the Touch ID.
It may or may not be a big deal, but it just shows that not even all M9 coprocessors are even equal. With the 12.9" being the only A9 series chip and M9 coprocessor device out of 4 products that doesn't do everything the chips were designed for.