NGA provides worldwide gravity compensation data in support of U.S. military operations, mission planning, and safety of navigation. The 2 by 2 arc-minute spaced deflection of the vertical (DOV) data product is provided globally in terms of north-south and east-west components, with error estimates included. The unit of measurement is arc-seconds. This global coverage is repeated for a range of altitudes from 0 to 90,000 feet above mean sea level.
This data is essential to the accuracy and effectiveness of high order inertial navigation systems (INS). It aids in the reduction of position and velocity error and improves orientation control when introduced into the INS solution.
phone (314) 676-9127, DSN 846-9127
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