A device and method for anterior atlantoaxial stabilization may include one or more plates having a plurality of openings for receiving screws configured to screw into one or more C1 articular pillars, one or more C2 articular pillars, and the C2 body. A method for searching satellite signals in a receiver includes performing a plurality of searches sequentially. Then, a color-difference vector indicative of the magnitude and direction of a color-difference between the notice pixel and neighboring pixels disposed adjacent thereto is calculated, and a directional component which is a component of the color-difference vector in the specified direction is calculated. The multiple actions are prioritized according to the current health profile and designated allowances for the user at the personal health monitoring system, such that the personal health monitoring system aids the user in selecting from among the multiple actions in order to balance the comprehensive health of the user.