The crossword solutions for the term GPS PART: ABBR. are SYST (4 letters) and SYS (3 letters). GPS stands for Global Positioning System, which is a satellite-based navigation system that provides location and time information in all weather conditions. SYST stands for System, which is a set of interacting or interdependent components forming an integrated whole. SYS stands for System, which is a set of principles or procedures according to which something is done; an organized scheme or method.