H.R.5978 is working its way through Congress and if it becomes law, could re-establish eLoran as a backup for GPS.
This used and working Loran C receiver and manual are offered for sale. The receiver has an NMEA 0183 serial output which produces the strings necessary for an autohelm to navigate to a waypoint. The receiver and manual are available for $50 plus shipping. These items are located in Corpus Christi, Texas.