Abstract: A device and method for targeting objects and specifically for locating intramedullary screw openings is described. The device and method include a target magnet and a sensor comprising an elliptical array of magnetoresistive elements, designed to give information on the three-dimensional orientation of the magnet. The sensor array is designed such that each magnetoresistive element is a member of an opposing pair and relays information on their alignment with the target magnet. The array is connected to a display such that the position of the sensor in relation to the target magnet is easily discerned. The invention is lightweight and portable, capable of operating on batteries and can be used in primitive situations where a stable supply of electricity is not available.

Abstract: Systems and methods for determining engine oil temperature without an oil temperature sensor infer the oil temperature at engine start based on the calculated temperature at power down and various other parameters which may include engine coolant temperature, soak time, ambient temperature, and whether an engine block heater has been used. The invention provides a more accurate determination of engine oil temperature to allow more precise engine control particularly during cranking and during the first few minutes of engine operation.