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OMEGA NAVIGATIONAL SYSTEM CONDUCTIVITY MAP
DECO ELECTRONICS INC BOULDER CO
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A conductivity map of North America has been prepared showing effective earth conductivity values for a 10 kcs propagating wave. This map was prepared as an aid in propagation studies and chart preparations for the Omega Navigational System using a technique referred to as geologic correlation. Values of conductivity were determined for regions whose boundaries are based upon climatological, pedological, physiographical, and geological information. Regional values were based whenever possible on available conductivity data taken within these regions. Additional fourterminal array conductivity measurements were made in the permafrost region of the Canadian Shield and along the Gulf Coast to aid in the determination of conductivities for these regions. The effective conductivity map is printed on a 17 X 22 inch sheet, and utilizes color hue and saturation to present effective conductivity values in half-decade steps from 1 X 0.00001 mhometer for the Greenland ice-cap to 3 X 0.01 mhometer. Confidence and variability factors are indicated on the map.
APPROVED FOR PUBLIC RELEASE