Most heavy industrial machines are capable of unstable configurations. The center of gravity is constantly changing as the position and loading of the armatures change. While skilled operators rely on their experience to prevent instability, electronic sensing can alert the operator even when experience fails. Such equipment includes forest harvesters, excavating equipment, front loaders, bulldozers, road graders, tractors, fork-lifts, as well as container handling equipment. Other industrial applications include oil and gas directional drilling equipment, auto-steering and tilt-compensating agricultural equipment, pipe inspection robots, marine trimming, and railway track monitoring.