Natsushima

Japan is the country of registry for 2,663 vessels in this directory. 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 14 research / surveys flying the Japan flag.

Natsushima 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. 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.

The registry attributes 83 vessels to Kawasaki Heavy Industries, with a median tonnage of 30,812 GT, delivered between 1930 and 2020. See the rest of that yard’s output.

At 67.4 m overall, Natsushima is 3.6 m shorter than the 71.0 m median for research / surveys on record.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 7819785 this registry holds 52 other vessels, whose median build year is 1979 and which range from 1978 to 1982. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1981.

Its IMO number, 7819785, carries its own check digit. The first six digits are weighted seven down to two and summed — 7×7 + 8×6 + 1×5 + 9×4 + 7×3 + 8×2 = 175 — and the last digit of that total, 5, must equal the seventh digit, 5. It does, so this number is well formed.