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Open data · every figure carries its source

Largest in this registry
#19,079
of 84,014 with a recorded tonnage
Largest cruise ship
#283
of 504 of this type with a recorded tonnage
Largest in its fleet
#5
of 8 in this fleet with a recorded tonnage
In brief
Sirena, formerly R Four, Tahitian Princess, and Ocean Princess, is an R-class cruise ship formerly owned by Princess Cruises. When part of the Princess fleet, along with the Pacific Princess, Ocean Princess was one of the two smallest in the fleet. In March 2016, she was sold to Oceania Cruises and renamed Sirena.
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.
At 30,277 gross tons, MS Sirena is the 19,079th largest of the 84,014 vessels in this registry that report a tonnage. The median across that set is 5,994 GT, so this hull is about 5.1 times the typical vessel on record here. The largest measures 499,167 GT.
Among the 665 cruise ships held here, it ranks 283rd by tonnage — larger than 43% of that group. Their median tonnage is 43,009 GT, and the largest tenth begin at 143,289 GT. The flag most often flown by this group is The Bahamas (133 ships). The yard that appears most often against it is Fincantieri, with 112 hulls on record.
Marshall Islands is the country of registry for 3,838 vessels in this directory, of which MS Sirena is the 2,124th largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (2,407 ships), and the median vessel measures 32,987 GT. Browse every ship flagged Marshall Islands.
Narrowing to both dimensions at once, this registry holds 14 cruise ships flying the Marshall Islands flag, of which 6 are larger by tonnage.
MS Sirena was built in 1999, making it 27 years old. It is one of 1,252 hulls in this registry delivered that year, a cohort whose median tonnage is 8,594 GT; within it this ship is the 267th largest. Across the whole of the 1990s the registry holds 12,006 vessels, median 4,956 GT. The median build year across the entire registry is 1995.
The registry attributes 123 vessels to Chantiers de l'Atlantique, with a median tonnage of 63,786 GT, delivered between 1912 and 2026. See the rest of that yard’s output.
At 179.0 m overall, MS Sirena is 19.1 m shorter than the 198.1 m median for cruise ships on record, with a beam of 30.0 m and a draft of 6.0 m.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 9187899 this registry holds 60 other vessels, whose median build year is 1999 and which range from 1998 to 2004. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1999.
Its IMO number, 9187899, carries its own check digit. The first six digits are weighted seven down to two and summed — 9×7 + 1×6 + 8×5 + 7×4 + 8×3 + 9×2 = 179 — and the last digit of that total, 9, must equal the seventh digit, 9. It does, so this number is well formed.
Nearest by tonnage among cruise ships
| Ship | Built | Gross tonnage |
|---|---|---|
| MITSUI OCEAN SAKURA | 2010 | 32,346 |
| Empress of Britain | 1956 | 32,327 |
| Le Commandant Charcot | 2021 | 31,757 |
| MS Sirena (this ship) | 1999 | 30,277 |
| Viking Polaris | 2022 | 30,114 |
| MS Kungsholm | 1966 | 28,891 |
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.
Celebrity Millennium
2000 · 90,963 GT · Malta

MSC Armonia
1999 · 65,542 GT · Panama

Ambition
1999 · 48,200 GT · Italy

Azamara Journey
2000 · 30,277 GT · Malta

Azamara Quest
2000 · 30,277 GT · Malta

Azamara Onward
1999 · 30,277 GT · Bermuda

Regatta
1998 · 30,277 GT · Marshall Islands

MS Nautica
2000 · 30,277 GT · Marshall Islands
Same fleet
Provenance
| MS Europa |
| 1999 |
| 28,890 |