Tunnisuusjärjestelmässä

Tunnisuusjärjestelmässä refers to the system of tunnage in a nautical context. Tonnage, in shipping, is not a measure of weight but rather a measure of a ship's internal volume. The term "tunnisuusjärjestelmässä" specifically points to the operational framework or rules governing how this volume is calculated and applied. This system is crucial for various aspects of maritime operations, including taxation, registration, and regulation of vessels.

Historically, tonnage was a way to estimate the cargo-carrying capacity of a ship, often based on a unit called a "tun," which represented a barrel of wine or oil. Modern tonnage systems, however, are more standardized. The most common is the International Tonnage Certificate, established by the International Maritime Organization (IMO). This certificate details two primary measurements: gross tonnage (GT) and net tonnage (NT). Gross tonnage represents the total internal volume of the ship, excluding certain spaces like the machinery room. Net tonnage, on the other hand, represents the volume of the cargo-carrying spaces.

The tunnisuusjärjestelmässä dictates how these volumes are calculated using specific formulas based on the ship's dimensions. These calculated values then influence various fees and regulations. For instance, port dues, canal tolls, and manning requirements are often tied to a ship's tonnage. Understanding the tunnisuusjärjestelmässä is therefore essential for shipowners, operators, and maritime authorities to ensure compliance and fair assessment of charges and regulations.