Wondering how you guys think the movi would perform on a moving subway car. If anyone has ever shot handheld on a subway they can attest it is no easy feat. It's very unlikely we will be able to be on sticks and will need to move around with ease. The movi seems like a great small footprint stabilized head alternative but I am concerned about the acceleration/deceleration of the train drifting the camera without a GPS signal. Thoughts? Anyone tried this?