In one embodiment, the method includes determining reference picture index numbers in a reference picture list. Components such as unattended ground sensors are deployed according to a method which includes incorporating the components into an elongated ejection system to form a payload assembly, the ejection system including axially-displaced ejector bays each for holding respective components. The method further includes multiplying the continuous-time digital signal and each of the delayed versions by one or more associated coefficients, so as to produce a set of products, then adding the set of products, so as to produce a sum value corresponding to the analog signal processed by a transfer function defined by the associated coefficients. The levelor is positionable on the neutralizer and has a plurality of adjustable arms to transfer the neutral angle from the neutralizer to the levelor. Once detection is made, a warning signal may be generated and issued to the user. When the device receives a notification that the magnetometer data may be inaccurate, the device can determine the heading of the device using angular rate data.