; (5) be synchronized with coordinated universal time; (6) be resilient and extremely difficult to disrupt or degrade; (7) be able to penetrate underground and inside buildings; (8) be capable of deployment to remote locations; (9) take full advantage of the infrastructure of the existing, unused Coast Guard long-range navigation system (commonly known as LORAN–C ), and subject to the concurrence and agreement of other agencies, unused facilities associated with the Ground Wave Emergency Network and Nationwide Differential GPS systems; (10) utilize and leverage the capabilities of the entity for development, building, and operation of the system; (11) function in an interoperable and complementary manner with other similar positioning, navigation, and timing systems; (12) be made available by the Secretary for use by other Federal agencies for public purposes at no cost