The speed down sensor measures the velocity in the Z axis of the platform. Works in the same way as the altimeter, but in this case, instead of a position reading, the magnitude measured is velocity.
Speed Down - Menu Parameters
Sensor variance. Variance of the error of the sensor in meters per second squared.
Input variable. It indicates the variable that contains the information from the sensor.
Tilt limits. The sensor measures the variable in a direction perpendicular to the longitudinal axis of the platform, so when it is tilted the reading will not be reliable. This option allows the definition of a tilt limit, so that if the limit is reached, the sensor reading will be discarded.
Speed limits. Defines the limits of the speed measured by the sensor.