1. A system for processing positioning signals, the system comprising; a tracker hardware interface configured to receive positioning information including raw GPS positioning data; a memory comprising a GPS library comprising a user interface, a tracker interface, and an operating system interface, the tracker interface comprising at least one tracker interface function for communicating over the tracker hardware interface and the user interface comprising at least one user interface function associated with a restart mode; and a processor configured to execute the tracker interface function by transmitting the raw GPS positioning data to a positioning engine configured to determine a position from the positioning data; wherein the positioning engine is configured to execute on the processor separately from a user program that executes on the processor, the user program displaying location information derived from the raw GPS positioning data.