River 21

At 51,967 gross tons, River 21 is the 9,442nd 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 8.7 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 5,143rd by tonnage — larger than 90% 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.

Tuvalu is the country of registry for 239 vessels in this directory, of which River 21 is the 19th largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (115 ships), and the median vessel measures 8,517 GT. Browse every ship flagged Tuvalu.

Narrowing to both dimensions at once, this registry holds 115 vessels this registry holds no type classification for flying the Tuvalu flag, of which 7 are larger by tonnage.

River 21 was built in 1981, making it 45 years old. It is one of 1,653 hulls in this registry delivered that year, a cohort whose median tonnage is 3,186 GT; within it this ship is the 44th largest. Across the whole of the 1980s the registry holds 13,213 vessels, median 3,004 GT. The median build year across the entire registry is 1995.

At 243.0 m overall, River 21 is 128.0 m longer than the 115.0 m median for vessels this registry holds no type classification for on record.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 7929310 this registry holds 46 other vessels, whose median build year is 1980 and which range from 1946 to 1984. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1981.

Its IMO number, 7929310, carries its own check digit. The first six digits are weighted seven down to two and summed — = 160 — and the last digit of that total, 0, must equal the seventh digit, 0. It does, so this number is well formed.