Zuiko Maru

At 118,118 gross tons, Zuiko Maru is the 2,249th 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 the typical vessel on record here. The largest measures 499,167 GT.

Among the 2,402 tankers held here, it ranks 53rd by tonnage — larger than 98% of that group. Their median tonnage is 8,256 GT, and the largest tenth begin at 42,340 GT. The flag most often flown by this group is Panama (219 ships). The yard that appears most often against it is HD Hyundai Mipo, with 175 hulls on record.

Japan is the country of registry for 2,663 vessels in this directory, of which Zuiko Maru is the 77th largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (1,534 ships), and the median vessel measures 764 GT. Browse every ship flagged Japan.

Narrowing to both dimensions at once, this registry holds 45 tankers flying the Japan flag, of which none is larger than Zuiko Maru.

Zuiko Maru was built in 1971, making it 55 years old. It is one of 1,927 hulls in this registry delivered that year, a cohort whose median tonnage is 2,462 GT; within it this ship is the 16th 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.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 7038989 this registry holds 63 other vessels, whose median build year is 1971 and which range from 1965 to 1971. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1971.

Its IMO number, 7038989, carries its own check digit. The first six digits are weighted seven down to two and summed — 7×7 + 0×6 + 3×5 + 8×4 + 9×3 + 8×2 = 139 — and the last digit of that total, 9, must equal the seventh digit, 9. It does, so this number is well formed.