Björn Vrooman Feb 19, 2019:

Hello David Anytime. Though, to be clear, I'm not entirely sure about the certficate. I've been translating some marine/maritime stuff lately, but I'm still learning.

However, I can't be that far off.

The list of certificates from the German BSH: https://www.deutsche-flagge.de/en/german-flag/changing-flag/...

In the UK:
"YDSA provides Surveys for Tonnage and Measurement, resulting in a Certificate of Survey for Tonnage and Measurement. This certificate is one of the documents you need to register your vessel on Part 1 of the UK Ships Register."
https://ydsa.co.uk/registration/

The Eichschein (section 8):
https://www.gesetze-im-internet.de/binscheo/BJNR017850975.ht...

What they're doing here is a "survey," no?

This could be a match:
"The vessel has to be measured for tonnage by an MCA authorised marine surveyor and the vessel’s registered Official Number and Registered Tonnage has to be ‘carved into the main beam’...The vessel, these days, is then issued with an encapsulated A4 sheet with her registered dimensions and other details and which has to be renewed every five years."
https://www.iims.org.uk/registration-tonnage-explained

Best

David Williams (asker) Feb 19, 2019:

Björn Very many thanks!

Björn Vrooman Feb 19, 2019:

Official explanation "Bemessungsgrundlage für

...
2.
Binnenschiffe ist die aus dem Eichschein ersichtliche maximale Tragfähigkeit in metrischen Tonnen (Eichtonnen)."

So while dwt is one thing, it's not all you need. I think here's the missing part:
https://navsregs.wordpress.com/2016/09/04/what-is-the-intern...

Best wishes

PS
https://www.ldoceonline.com/dictionary/deadweight-tonnage
https://www.ldoceonline.com/dictionary/deadweight-carrying-c...

Also, deadweight in this sense is used as an adjective:
https://www.ldoceonline.com/dictionary/deadweight

Björn Vrooman Feb 19, 2019:

@David Did you see the Wiki entry?
"Deadweight Tons
Für Handelsschiffe ist stattdessen die Tragfähigkeit wichtig. Diese wird mit den englischen Begriffen deadweight tonnage (dwt) oder tons deadweight (tdw) bezeichnet. Die Angabe tons deadweight all told (tdwat, auch TDWAT, T dwat oder einfach tdw) bezeichnet die Gesamt-Tragfähigkeit eines Handelsschiffes. Errechnet wird dieses Maß aus der Differenz der Wasserverdrängung des bis zur höchstzulässigen Lademarke belasteten Schiffes und jener des unbelasteten Schiffes. Maßeinheiten sind wahlweise metrische Tonnen zu je 1000 kg oder englische long tons (tn. l.) zu 1.016 kg."
https://de.wikipedia.org/wiki/Schiffsmaße#Deadweight_Tons

See also https://en.wikipedia.org/wiki/Deadweight_tonnage

"In modern international shipping conventions [...], deadweight is explicitly defined as the difference in tonnes between the displacement of a ship in water of a specific gravity of 1.025 (corresponding to average density of sea water) at the draft corresponding to the assigned summer freeboard and the light displacement."

David Williams (asker) Feb 18, 2019:

Yes exactly

philgoddard Feb 18, 2019:

I think "tonnen 2,1" may mean " tonnes at 2.1 metres".