Abstract: A sensing device for a crane detecting unsafe operating conditions includes an inertial measurement unit for measuring pitch and yaw of a hook of the crane attached to a load. The inertial measurement unit is adapted to measure deviation of the hook of the crane from a plumb position and activate an alert element if the deviation of the hook exceeds a predetermined limit.

Abstract: A heads-up display apparatus adapted to be mounted to a helmet or item of headgear to display an image to a user includes a housing and an image projection system. The image projection system includes an electronic display, a display controller adapted to receive and process data presented on the electronic display, an aspherical lens, a semi-transparent display panel locatable in a line of sight of a user, and a front surface mirror for reflecting light emitted from the electronic display through the aspherical lens onto the semi-transparent display panel. The electronic display, the aspherical lens and the front surface mirror are arranged within the housing, and the heads-up display apparatus minimises refocusing of an eye of a user when looking from a primary task to the display and back to the primary task.

Abstract: A sensing device for a crane for detecting unsafe operating conditions including an inertial measurement unit for measuring pitch and yaw of a hook of a crane attached to a load. The inertial measurement unit is adapted to measure deviation of the hook of the crane from a plumb position and activate an alert element if the deviation of the hook exceeds a predetermined limit.