At 199 gross tons, John Marshall is the 80,806th 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 30 times smaller than the typical vessel on record here. The largest measures 499,167 GT.
Among the 1,471 tugs held here, it ranks 1,010th by tonnage — larger than 20% of that group. Their median tonnage is 393 GT, and the largest tenth begin at 1,733 GT. The flag most often flown by this group is United States (239 ships). The yard that appears most often against it is Damen Shipyards Gorinchem, with 62 hulls on record.
United States is the country of registry for 2,278 vessels in this directory, of which John Marshall is the 1,399th 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 239 tugs flying the United States flag, of which 141 are larger by tonnage.
John Marshall was built in 1972, making it 54 years old. It is one of 1,928 hulls in this registry delivered that year, a cohort whose median tonnage is 2,016 GT; within it this ship is the 1,589th largest. Across the whole of the 1970s the registry holds 17,331 vessels, median 2,774 GT. The median build year across the entire registry is 1995.
The registry attributes 29 vessels to Main Iron Works, with a median tonnage of 207 GT, delivered between 1966 and 2009. See the rest of that yard’s output.
At 32.4 m overall, John Marshall is within a metre of the 32.3 m median length for tugs on record, with a beam of 9.1 m and a draft of 4.5 m.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 7223261 this registry holds 58 other vessels, whose median build year is 1972 and which range from 1966 to 1973. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1972.
Its IMO number, 7223261, carries its own check digit. The first six digits are weighted seven down to two and summed — 7×7 + 2×6 + 2×5 + 3×4 + 2×3 + 6×2 = 101 — and the last digit of that total, 1, must equal the seventh digit, 1. It does, so this number is well formed.
