The Xeetec MVS comes with a internal 2 axis G force sensor. on Some configurations the internal G sensor is not enabled , you should check you product documentation or online at www.xeetec.com.au/myMVS to check if your MVS has the internal G force Module Fitted with and is enabled, if your G sensor is not enabled you can purchase an upgrade serial number from Xeetec.
The internal G sensor zeros it self on startup, it is therefore advisable for best results for the vehicle to be stationary when the MVS is powered up.
Consideration should be made on installation of the MVS to its Position relative to the axis of the vehicle.