decommissioning of the French and Norwegian stations made the continuing pilot in the United Kingdom untenable, and SO the most promising initiative to adopt it widely was abandoned. Despite that, some countries, such as South Korea, who feel especially vulnerable to GNSS inter- ruptions, have continued to develop a PNT alternative using eLORAN. During 2019, the UrsaNav company, working for the Korea Research Institute of Ships and Oceans Engineering, installed a temporary eLORAN test transmission system. There also are plans by the Korea Ministry of Oceans and Fisheries to convert their two existing LORAN stations to eLORAN. They also intend to deploy differential eLORAN stations to improve accuracy down to about 5 m within a local reception area (within 50-60 km of the differential station). There are also reports that the Chinese government (and others) continue to work on either deploy- ing new transmitter stations or converting existing ones to eLORAN, although there is not much in- formation publicly available. Elsewhere, the timing and telecommunications community, especially in the United States, has lob- bied politicians to take an interest in legislating some backup alternative to the U.S. GPS system. After several false starts and legislative attempts, in late 2018, President Trump signed the National Timing Resilience and Security Act of 2018, which seeks to address the problem. The president also issued Executive Order 13905 titled Strengthening National Resilience Through Responsible Use of Positioning, Navigation, and Timing Services to increase efforts to provide backups to GPS. Plans to build a backup to space-based systems seem to be starting slowly, but momentum is building in the U.S. government and elsewhere to address the issue. Packet-Based Distribution Ever since the development of packet-based transport, engineers have devised methods to carry time and synchronize the clocks running on different nodes in the network. One of the early Internet protocols developed by the Internet Engineerin