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A public reference property of Baalvion
Open data · every figure carries its source
Unclassified
Operator on record: Und RO-RO (1998-1999)
Photo: Andrewrabbott · CC BY-SA 4.0 · file
Largest in this registry
#25,322
of 84,014 with a recorded tonnage
Largest unclassified
#14,112
of 49,696 of this type with a recorded tonnage
Fleet rank
—
No operator attributed to this ship
In brief
Kaiārahi is a roll-on/roll-off ferry operated by Interislander on the Wellington to Picton interisland route between the North and South islands of New Zealand. As of September 2025 Kaiarahi operates four crossings of the Cook Strait each day, taking on a new schedule after the retirement of the Aratere.
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 22,152 gross tons, MS Kaiarahi is the 25,322nd 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 3.7 times the typical vessel on record here. The largest measures 499,167 GT.
Among the 58,086 vessels this registry holds no type classification for held here, it ranks 14,112th by tonnage — larger than 72% of that group. Their median tonnage is 5,358 GT, and the largest tenth begin at 54,309 GT. The flag most often flown by this group is Panama (5,698 ships). The yard that appears most often against it is HD Hyundai Mipo, with 615 hulls on record.
United Kingdom is the country of registry for 2,394 vessels in this directory, of which MS Kaiarahi is the 305th largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (1,835 ships), and the median vessel measures 2,515 GT. Browse every ship flagged United Kingdom.
Narrowing to both dimensions at once, this registry holds 1,835 vessels this registry holds no type classification for flying the United Kingdom flag, of which 139 are larger by tonnage.
MS Kaiarahi was built in 1998, making it 28 years old. It is one of 1,367 hulls in this registry delivered that year, a cohort whose median tonnage is 7,381 GT; within it this ship is the 392nd 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 12 vessels to Navantia, with a median tonnage of 22,076 GT, delivered between 1983 and 2017. See the rest of that yard’s output.
At 179.9 m overall, MS Kaiarahi is 64.9 m longer than the 115.0 m median for vessels this registry holds no type classification for on record, with a beam of 24.3 m and a draft of 6.5 m.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 9147291 this registry holds 58 other vessels, whose median build year is 1997 and which range from 1996 to 2001. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1998.
Its IMO number, 9147291, carries its own check digit. The first six digits are weighted seven down to two and summed — 9×7 + 1×6 + 4×5 + 7×4 + 2×3 + 9×2 = 141 — and the last digit of that total, 1, must equal the seventh digit, 1. It does, so this number is well formed.
Nearest by tonnage among vessels this registry holds no type classification for
| Ship | Built | Gross tonnage |
|---|---|---|
| Grand Royal | 1987 | 22,155 |
| Ikan Progreso | 1977 | 22,155 |
| Ikan Veracruz | 1977 | 22,155 |
| MS Kaiarahi (this ship) | 1998 | 22,152 |
| Eec America | 1977 | 22,148 |
| Romea | 1995 | 22,147 |
| Rico |
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.
Provenance
| 1975 |
| 22,144 |