http://www.engineerlive.com/content/surface-mount-mems-angular-acceleration-sensor?dm_i=381,3L8QL,76PIS,CW30Z,1

I wonder if this can be used to track cops and FFs in buildings? Can
it measure steps taken? Can it measure turns and rolls?

It can measure angular acceleration and vibration

"Acceleration" is a change in velocity - which can be a change in
direction and/or speed

Might not be useful if riding an elevator or escalator

???????

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