The LORAN-C transmitter Jan Mayen[1] was a LORAN-C[2] transmission facility on the island of Jan Mayen at 70°54′51″N 8°43′57″W / 70.91417°N 8.73250°W / 70.91417; -8.73250.
The LORAN-C transmitter Jan Mayen used as an antenna had a 190-metre tall (625 ft) guyed mast.
This mast was built as a replacement of a 190.5 metre tall mast, which collapsed in a storm on 8 October, 1980 as the result of low tension on the guy-wires.
The guy-wires were adjusted by personnel from the USCG who mixed up pounds and kilograms.
[2] Both transmitters on Jan Mayen,[3] together with the other Norwegian LORAN-C transmitters at Bø, and those at Eiði in the Danish Faroe Islands, were shut off at midnight on 31 December, 2015.