USNS Mary Sears

At 4,201 gross tons, USNS Mary Sears is the 46,969th 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 1.4 times smaller than the typical vessel on record here. The largest measures 499,167 GT.

Among the 612 research / surveys held here, it ranks 138th by tonnage — larger than 71% 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 States is the country of registry for 2,278 vessels in this directory, of which USNS Mary Sears is the 465th largest by tonnage. 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 90 research / surveys flying the United States flag, of which 10 are larger by tonnage.

USNS Mary Sears was built in 2001, making it 25 years old. It is one of 1,268 hulls in this registry delivered that year, a cohort whose median tonnage is 14,062 GT; within it this ship is the 767th 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 40 vessels to Bollinger Mississippi Shipbuilding, with a median tonnage of 2,218 GT, delivered between 1972 and 2018. See the rest of that yard’s output.

At 100.3 m overall, USNS Mary Sears is 29.3 m longer than the 71.0 m median for research / surveys on record, with a beam of 58.0 m and a draft of 19.0 m.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 9207077 this registry holds 46 other vessels, whose median build year is 1999 and which range from 1998 to 2001. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 2001.

Its IMO number, 9207077, carries its own check digit. The first six digits are weighted seven down to two and summed — 9×7 + 2×6 + 0×5 + 7×4 + 0×3 + 7×2 = 117 — and the last digit of that total, 7, must equal the seventh digit, 7. It does, so this number is well formed.