; and (3) shall terminate upon the expiration of such 30-day period if the owner has not notified the Coast Guard of such change before the end of such period. (e) State and local authority To remove abandoned and derelict vessels Nothing in this section shall be construed to limit the authority of a State or local authority from taking action to remove an abandoned or derelict vessel. . 411. Backup global positioning system (a) In general Subtitle VIII of title 46, United States Code, is amended by adding at the end the following: 807 Position, Navigation, and Timing 80701. Land-based complementary and backup positioning, navigation, and timing system. 80701. Land-based complementary and backup positioning, navigation, and timing system (a) e LORAN Subject to the availability of appropriations, the Secretary shall provide for the establishment, sustainment, and operation of a reliable land-based enhanced LORAN, or eLORAN, positioning, navigation, and timing system. (b) Purpose The purpose of the system established under subsection (a) is to provide a complement to, and backup for, the Global Positioning System (in this section referred to as GPS ) to ensure the availability of uncorrupted and nondegraded positioning, navigation, and timing signals for military and civilian users in the event that GPS signals are corrupted, degraded, unreliable, or otherwise unavailable. (c) Requirements The system established under subsection (a) shall— (1) be wireless; (2) be terrestrial; (3) provide wide-area coverage; (4) transmit a precise, high-power 100 kilohertz signal and meet the one microsecond accuracy requirement specified in the Federal Radio Navigation Plan; (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