3-18 88° 84° 80° 84° 80° 88° SOUTH POLE 0° 180° 90° E 90° W 1,000,000mN 1,500,000mN 2,000,000mN 2,500,000mN 3,000,000mN SOUTH ZONE 88° 84° 84° 88° NORTH POLE 0° 180° 90° E 90° W 1,500,000mN 2,000,000mN 2,500,000mN NORTH ZONE Figure 3-22.  UPS North and South Grid