Mastery D

At 8,971 gross tons, Mastery D is the 37,459th 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 1.5 times the typical vessel on record here. The largest measures 499,167 GT.

Among the 3,881 container ships held here, it ranks 3,185th by tonnage — larger than 14% of that group. Their median tonnage is 33,698 GT, and the largest tenth begin at 140,096 GT. The flag most often flown by this group is Liberia (498 ships). The yard that appears most often against it is HD Hyundai Heavy Industries, with 348 hulls on record.

Mastery D 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 1,014th 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 78 vessels to Volharding Shipyards, with a median tonnage of 6,130 GT, delivered between 1939 and 2011. See the rest of that yard’s output.

At 154.6 m overall, Mastery D is 67.0 m shorter than the 221.6 m median for container ships on record and a draft of 7.0 m.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 9301201 this registry holds 80 other vessels, whose median build year is 2005 and which range from 2003 to 2007. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 2006.

Its IMO number, 9301201, carries its own check digit. The first six digits are weighted seven down to two and summed — 9×7 + 3×6 + 0×5 + 1×4 + 2×3 + 0×2 = 91 — and the last digit of that total, 1, must equal the seventh digit, 1. It does, so this number is well formed.