AWOL:
Remember that a body at constant velocity is not accelerating, so you can't tell if your device is stationary or moving at 100 kmh-1; you can only detect changes of velocity.
What about if it's changing direction but maintaining velocity? 
AWOL:
Remember that a body at constant velocity is not accelerating, so you can't tell if your device is stationary or moving at 100 kmh-1; you can only detect changes of velocity.
What about if it's changing direction but maintaining velocity?