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newbie question - what is this number?


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Maritime NZ https://www.maritimenz.govt.nz/commercial/ships/registration/default.asp

The tonnage is not displacement, but the theoretical cargo tonnage, known as Thames Tonnage. Often carved as NTxx . Island Times one is 13. No way she weighs, displaces, or could carry 13 ton, but it'

To do an international voyage you must be a registered ship. Doesn't have to be NZ.

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from my sailing database:

Mr Earp gave evidence that he knew of people who started construction on a boat and registered the vessel several years before launching it. The registration is not an annual fee, it is a one off payment. Builders will do this so they can place the number within the hull. The requirements for a metal vessel are that the number needs to be stamped into the hull permanently or welded onto the metal hull or transom and displayed on a continuous beam inside the vessel. The metal plate is about the size of a cigarette carton and has an O.N. O/N or “Official Number”. Mr Earp gave evidence that most people prefer to do this while the vessel is under construction and agreed it would be unusual to do this without there having already been some construction of the boat being undertaken.
the vessel was constructed structurally to Class 1B of the Universal Shipping Laws Code in 1995. The impact of this, on the value of the boat, is that it is in the region of 20-30 per cent more valuable than a non-approved design. It affects the overall value of the vessel because of the commercial potential. The classification 1B is a passenger going vessel considered to be suitable for offshore operations up to 200 nautical miles from land or safe haven.

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My yacht came with the OT number carved in an overhead frame.I think it means you are listed with Lloyds of London (no idea why). I am not on the NZ register(meaning cant race with NZY,cant go overseas,no sail number,no sole rights to boat name)     You can search the NZ register on line for your boat name/number. A fee for change of owner.

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The tonnage is not displacement, but the theoretical cargo tonnage, known as Thames Tonnage. Often carved as NTxx . Island Times one is 13. No way she weighs, displaces, or could carry 13 ton, but it's a measurement of the space inside. IT'S actual displacement is 7-8 ton dependent on load.

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9 hours ago, Kevin McCready said:

from my sailing database:

Mr Earp gave evidence that he knew of people who started construction on a boat and registered the vessel several years before launching it. The registration is not an annual fee, it is a one off payment. Builders will do this so they can place the number within the hull. The requirements for a metal vessel are that the number needs to be stamped into the hull permanently or welded onto the metal hull or transom and displayed on a continuous beam inside the vessel. The metal plate is about the size of a cigarette carton and has an O.N. O/N or “Official Number”. Mr Earp gave evidence that most people prefer to do this while the vessel is under construction and agreed it would be unusual to do this without there having already been some construction of the boat being undertaken.
the vessel was constructed structurally to Class 1B of the Universal Shipping Laws Code in 1995. The impact of this, on the value of the boat, is that it is in the region of 20-30 per cent more valuable than a non-approved design. It affects the overall value of the vessel because of the commercial potential. The classification 1B is a passenger going vessel considered to be suitable for offshore operations up to 200 nautical miles from land or safe haven.

you should note that the above is for Australian USL surveyed vessels, NZ has different laws and regulations.

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