SS Explorer

At 862 gross tons, SS Explorer is the 67,413th 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 7.0 times smaller than the typical vessel on record here. The largest measures 499,167 GT.

Among the 612 research / surveys held here, it ranks 358th by tonnage — larger than 26% 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.

SS Explorer was built in 1955, making it 71 years old. It is one of 201 hulls in this registry delivered that year, a cohort whose median tonnage is 1,864 GT; within it this ship is the 39th largest. Across the whole of the 1950s the registry holds 2,005 vessels, median 960 GT. The median build year across the entire registry is 1995.

The registry attributes 14 vessels to Alexander Hall & Co., with a median tonnage of 226 GT, delivered between 1877 and 1955. See the rest of that yard’s output.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 5110939 this registry holds 11 other vessels, whose median build year is 1958 and which range from 1909 to 1962. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1955.

Its IMO number, 5110939, carries its own check digit. The first six digits are weighted seven down to two and summed — 5×7 + 1×6 + 1×5 + 0×4 + 9×3 + 3×2 = 79 — and the last digit of that total, 9, must equal the seventh digit, 9. It does, so this number is well formed.