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Open data · every figure carries its source

Rig / offshore unit
Operated by United States Navy
Photo: from DANFS provided by by Joe Radigan MACM USN. · Public domain · file
No gross tonnage is recorded for this vessel, so it cannot be ranked by size. Rank is only shown where the underlying measurement exists.
Vessel particulars
Every value is as recorded in the source. Blanks are values the source does not hold — none is estimated from a sister ship or a class average.
Identification
Construction
Measurements
In context
Every figure in this section is a count, a rank or a percentile over vessels actually held in this registry — not over the world fleet, which is larger. Nothing here is estimated.
United States is the country of registry for 2,278 vessels in this directory. The most common class under that flag is vessels this registry holds no type classification for (977 ships), and the median vessel measures 1,706 GT. Browse every ship flagged United States.
Narrowing to both dimensions at once, this registry holds 66 rig / offshore units flying the United States flag.
Mission Capistrano was built in 1944, making it 82 years old. It is one of 174 hulls in this registry delivered that year, a cohort whose median tonnage is 7,176 GT. Across the whole of the 1940s the registry holds 1,039 vessels, median 4,053 GT. The median build year across the entire registry is 1995.
The registry attributes 18 vessels to Marinship, with a median tonnage of 14,770 GT, delivered between 1943 and 1966. See the rest of that yard’s output.
At 159.6 m overall, Mission Capistrano is 85.6 m longer than the 74.0 m median for rig / offshore units on record.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 7517466 this registry holds 56 other vessels, whose median build year is 1976 and which range from 1944 to 1979. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1944.
Its IMO number, 7517466, carries its own check digit. The first six digits are weighted seven down to two and summed — 7×7 + 5×6 + 1×5 + 7×4 + 4×3 + 6×2 = 136 — and the last digit of that total, 6, must equal the seventh digit, 6. It does, so this number is well formed.
Nearest by IMO number
| Ship | IMO | Built |
|---|---|---|
| USNS Longview | 7517442 | 1950 |
| Citadel | 7517428 | 1945 |
| MV Arctic | 7517507 | 1978 |
| Tramola 2 | 7517519 | 1977 |
Record
Events recorded against this vessel in the source, with the dates the source gives. An event with no date is listed last rather than assigned one.
Same yard, same years
No ship class is recorded for this vessel, so these are not asserted to be sister ships — they are contemporaries from the same builder, shown because that is what the data supports.

USNS Vanguard
1944 · 15,309 GT · United States

USNS Mission Purisima
1943 · United States

USS Soubarissen
1945 · United States
USNS Mission San Gabriel
1944 · United States

USNS Mission San Luis Obispo
1944 · United States
USS Tomahawk
1944 · United States
USNS Mission San Diego
1944 · United States

USNS Mission Dolores
1944 · United States
Same fleet
Provenance
Vessel recordWikidata, released under CC0, keyed on this ship’s IMO number.
Written summaryNo English Wikipedia article is linked to this vessel, so no summary is shown.
PhotographBy from DANFS provided by by Joe Radigan MACM USN., reused under Public domain.