Universal Polar Stereographic Coordinate System
The Universal Polar Stereographic (UPS) coordinate system is used in conjunction with the Universal Transverse Mercator (UTM) coordinate system to locate positions on the surface of the earth. Like the UTM coordinate system, the UPS coordinate system uses a metric-based cartesian grid laid out on a conformally projected surface. UPS covers the Earth's polar regions, specifically the areas north of 84° N and south of 80° South, which are not covered by the UTM grids, plus an additional 30 minutes of latitude extending into UTM grid to provide an amount of overlap between the two systems.
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