The disclosure is directed to a method, computer program product, mobile device or a system allowing for determining various route metrics based on stored route records associated with routes traversed by the mobile device. The controllable delay circuit generates a delayed clock signal from a reference clock signal. Finally, the invention concerns the use of these compounds, and particularly 2\u2032,3\u2032dideoxy-\u03b2-L-fluorocytidine, as drugs, and especially as anti-viral agents. A locking wedge mechanism locks the arms together when weight is placed on the support platform due to engagement of an actuating arm which projects from the keyboard support platform and activates the wedge mechanism.