Coordinates: 42°42′50.60″N 76°49′33.86″W / 42.7140556°N 76.8260722°W The LORAN-C transmitter Seneca was the master station of the Northeast US LORAN-C Chain (GRI 9960) and the X-Ray secondary station of the Great Lakes Chain (GRI 8970). It was located within the Seneca Army Depot in Romulus, New York, south of Geneva. It used a 1000 kilowatt, 742 foot (226.2 m) guyed mast that was constructed in 1977 and dedicated on August 2, 1978. The station was operated by United States Coast Guard and was located on a 250-acre (1.0 km2) piece of land within the 10,587 acre facility. The transmitter was used to guide ships and aircraft up to 1,000 miles (1,600 km) away. It was the first LORAN station to use solid state versus vacuum tube components.
The station, was shut down for good on February 9, 2010 at 3:00 PM EST. The tower was dismantled shortly after decommissioning of the LORAN-C system and is currently stacked in pieces next to the transmitter building awaiting further disposition.