At 302 gross tons, Alert is the 77,903rd 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 20 times smaller than the typical vessel on record here. The largest measures 499,167 GT.
Among the 612 research / surveys held here, it ranks 440th by tonnage — larger than 9% of that group. Their median tonnage is 2,180 GT, and the largest tenth begin at 9,452 GT. The flag most often flown by this group is United States (90 ships). The yard that appears most often against it is Wärtsilä, with 36 hulls on record.
United Kingdom is the country of registry for 2,394 vessels in this directory, of which Alert is the 1,704th 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 25 research / surveys flying the United Kingdom flag, of which 15 are larger by tonnage.
Alert was built in 2006, making it 20 years old. It is one of 2,118 hulls in this registry delivered that year, a cohort whose median tonnage is 8,539 GT; within it this ship is the 1,910th largest. Across the whole of the 2000s the registry holds 18,605 vessels, median 9,957 GT. The median build year across the entire registry is 1995.
The registry attributes 63 vessels to Remontowa, with a median tonnage of 2,448 GT, delivered between 1980 and 2025. See the rest of that yard’s output.
At 39.0 m overall, Alert is 32.0 m shorter than the 71.0 m median for research / surveys on record, with a beam of 8.0 m and a draft of 2.7 m.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 9338618 this registry holds 65 other vessels, whose median build year is 2007 and which range from 2004 to 2009. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 2006.
Its IMO number, 9338618, carries its own check digit. The first six digits are weighted seven down to two and summed — 9×7 + 3×6 + 3×5 + 8×4 + 6×3 + 1×2 = 148 — and the last digit of that total, 8, must equal the seventh digit, 8. It does, so this number is well formed.
