A tracking ship, also called a missile range instrumentation ship or range ship, is a ship equipped with antennas and electronics to support the launching and tracking of missiles and rockets. Since many missile ranges launch over ocean areas for safety reasons, range ships are used to extend the range of shore-based tracking facilities.
In the United States, the initial tracking ships were constructed by the U.S. Army and then the U.S. Air Force to support their missile programs. They were generally built on a surplus Liberty ship or Victory ship hull. By 1964, the U.S. Navy took over all the range ships and introduced more.
In some Navies, such a ship is also given the Type Designation "Vigilship" or "Veladora", with the Designation Letter "V" or Letters "VC".[1]
USNS Vanguard underwayU.S. Army tracking ship (1958–1964) USAS American Mariner docked at Chaguaramus, Trinidad missing name being supplied with additional fresh water from missing name, December 1961
There are currently only two active Instrumentation Ships in the U.S. Navy inventory: missing name[6] and missing name.[7] The former is now in the inactive fleet. The latter was delivered in January 2012[8] to replace USNS Observation Island (T-AGM-23) in 2014.[9] Most of the USN and USAF tracking ships were converted into their role. Some ships were in service with NASA.
Inactive
USNS Range Tracker (T-AGM-1), 1961–1969 - built as Victory ship (transport/freighter)
USNS Range Recoverer (T-AGM-2), 1960–1972 - built for US Army
USNS Longview (T-AGM-3), 1959–1976? - built as Victory ship
USNS Richfield (T-AGM-4), 1960–1968 - built as Victory ship
USNS Sunnyvale (T-AGM-5), 1960–1974 - built as Victory ship
USNS Watertown (T-AGM-6), 1960–1972 - built as Victory ship
USNS Huntsville (T-AGM-7), 1960–1974 - built as Victory ship
USNS Wheeling (T-AGM-8), 1962–1990 - built as Victory ship
USNS General H. H. Arnold (T-AGM-9), 1961–1982 - built as C4 class troop ship
USNS General Hoyt S. Vandenberg (T-AGM-10), 1963–1983 - built as C4 class troop ship
USNS Twin Falls (T-AGM-11), 1964–1972 - built as Victory ship
USNS American Mariner (T-AGM-12), 1959–1966 - built as Liberty ship (transport/freighter), US Coast Guard training ship