Great narration, love it! I had never heard the term lock rash before, so you've taught me something new. I'm really enjoying your ship videos. Keep up the great work. 👍
Gross tonnage(GT) or gross registered tonnage(GRT) is actually a measure of volume of internal cargo carrying space. Dead weight tonnage(DWT) is the amount of weight it can carry in cargo, fuel, crew, provisions, etc. Which in this case is listed in Wikipedia as 37,690. Just about every one gets that wrong. Including a lot of people who should know better. Although the way you worded it in your verbal and written description, you were not wrong technically, so I will give you credit for that. LOL. Then there is "Displacement" which is the actual amount of weight of water the ship displaces at any given time, which can vary greatly whether it is empty or full of cargo. On large passenger ships or large warships that generally don't carry cargo you might hear the phrase "Full load displacement" which is pretty much self explanatory. So congratulations! you are now among the 1% that know and can use the correct nautical terminology.
Really appreciate you taking the time to dumb this down for us landlubbers! When referencing cargo capacity I've mostly seen the gross tonnage mentioned, so I've just blindly followed suit in the past. Sounds like GT only describes the designed cargo capacity, while DWT more describes how much total weight the ship can carry - so if carrying dense cargo like iron ore you'd likely be more concerned about the weight (DWT) than the GT - if you're full on fuel and provisions you might not be able to fill the cargo hatches to the top?
@@NorthernElevations Yes, you have the right idea. When loading a heavy cargo like iron ore they will load until the ship sinks down low enough in the water to reach the "Plimsoll marks"(another nautical term) painted on the outside of the hull. That indicates a full load. A full load of raw iron ore or taconite pellets might only fill half of the cargo holds, and the ship will be riding as low in the water as safety permits. Then with a lightweight cargo like grain you will load up right to the top with the holds completely full, and the ship will still not be riding very deep in the water and could take more weight but there is no more space. That is sometimes called "cubing out", referring to cubic space. Gross tonnage or Registered gross tonnage is often used to determine port and dockage fees, or things like ship classification and legal matters.
