Initial Operational Capability (IOC)

From International Dictionary of Marine Aids to Navigation
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Operational status of a GNSS or other radio-navigation system declared by the providing authority, when the system is considered usable, but before validation has been fully completed.

Source: Nick Ward, Vicechair, IALA e-Nav Committee, March 2009

Global Navigation Satellite System

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM