1. What is Gross Registered Tonnage?

Gross Registered Tonnage (GT) is a measure of a ship's total internal volume, calculated using a mathematical formula. It represents the overall size and cargo-carrying capacity of a vessel and is used for regulatory purposes, port dues, and safety rules.

2. How Does the Calculator Work?

The calculator uses the GT formula:

Where:

• \( GT \) — Gross Tonnage
• \( V \) — Total volume in cubic meters (m³)
• \( \log_{10} \) — Base-10 logarithm

Explanation: The formula provides a non-linear relationship between a vessel's volume and its gross tonnage, with larger vessels having a lower tonnage-to-volume ratio.

3. Importance of GT Calculation

Details: Gross Tonnage is crucial for determining port fees, safety regulations, manning requirements, and vessel registration. It's an international standard used in maritime law and insurance calculations.

4. Using the Calculator

Tips: Enter the total internal volume of the vessel in cubic meters. The volume must be greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between GT and displacement tonnage?
A: GT measures internal volume, while displacement tonnage measures the actual weight of water displaced by a vessel.

Q2: How is volume (V) typically measured for ships?
A: Volume is calculated from the ship's architectural plans, measuring all enclosed spaces of the vessel.

Q3: Why does the formula use a logarithmic function?
A: The logarithmic component accounts for the fact that larger ships have more efficient use of space, resulting in a lower tonnage-to-volume ratio.

Q4: Is GT the same for all types of vessels?
A: The formula is standardized internationally, but different vessel types may have specific measurement conventions for certain spaces.

Q5: How often should GT be recalculated?
A: GT should be recalculated whenever significant structural modifications are made to a vessel that change its internal volume.